eufy RoboVac L70 Robo Vac and Mop (Open Box)

I've owned a few of these units--they don't work for long, and contacting customer support for help is a horrendous experience--where the rep made apparently erroneously instructed me to send back a unit for a refund, didn't refund me the full amount, and then it turns out he wasn't supposed to issue the refund (even though I returned the unit), so decided to correct that by first sending me threatening emails and then voiding out the warranty on the unit I still owned. I'm still trying to get that resolved, because now THAT unit also doesn't work... The up-shot is that this is a REALLY unreliable product and customer support is terrible, where they make mistakes and then try to punish the customers for those mistakes. Again, I've been dealing with them since Dec 2019, so this review comes from extensive interactions and I have emailed to prove what happened. POOR PRODUCT: I've owned 3 of these units, the first one purchased in Dec 2019. None of them has lasted more than a few months, and 1 of them started to malfunction within a few days. One gave a recurring Error #18 which I couldn't resolve (I tried to do all the troubleshooting--Eufy doesn't provide good documentation for troubleshooting at all), so this ended up being a warranty replacement. The replacement unit lost all ability to navigate within a few months, so it's essentially useless now--it goes around in circles aimlessly and crashes into things without course-correcting. Another unit I had kept giving a recurring Error #14, again I couldn't troubleshoot it, so that one was also replaced. Within two days, the replacement stopped recognizing that the mop attachment was attached and wouldn't mop anymore. I ended up having to return that unit. TERRIBLE SUPPORT: My experience with customer support has been a nightmare. The second unit I had (the one with the recurring Error #14) was given to me new in unopened packaging as a gift. I only used it a few times when the constant error started randomly. The customer rep decided that it should be replaced (apparently each unit comes with a 1-time warranty replacement). So I packaged it up, sent it back, and received a replacement unit. This was the unit that stopped mopping after 2 days. So I contacted customer support again. At this point, they said they can only refund me if I sent it back, and they sent me a return label NOT for that unit, but for my OTHER unit (the one I actually purchased on Amazon). So, I reminded them, I wasn't returning my purchased unit, but the gifted unit. So the rep suggested that, since they couldn't refund me on any "original form of payment", since I didn't purchase it, they would send me an Amazon e-gift card to my Amazon account. So, I packaged it up in its original box and sent it back. I received an e-gift card on my Amazon account for the sale purchase price (and not the taxes). Then the rep started emailing me to say that unless I produce the original receipt for that gifted unit, either I would have to send back the refund or they would void out the warranty on my PURCHASED unit (the one I myself bought on Amazon in Dec 2019 that I still had in my possession). Before sending it back, I had never been asked for the receipt, and again, because it was a gift, I didn't have that. So to correct for their mishandling of this situation (apparently they aren't supposed to service "gifted units" without proof of purchase, now we had a mess). The customer rep decided that the way to fix his mistake was to tell me to send back the refund or he would void out the warranty on my other unit (the one I purchased myself). But of course, there was no mention of the fact that I had sent them back the basically new (yet not properly functioning) gifted unit--so I was either going to out both the vacuum and the refund or the vacuum and the warranty protection on my OTHER unit. I told him NOT to void the warranty on my other unit. A supervisor stepped into the email exchange that this point and agreed it was improper to void the warranty on my purchased unit to remedy the error regarding the gifted unit, but he repeated the demand for me to send back the refund (again, why should I do that when (a) it wasn't my error in implementing the servicing policies and (b) I had already returned the refunded unit to them?????). So I stopped communicating with them, since it was getting stupid. A month ago, my purchased unit stopped working properly (it can't navigate anymore--as I described above). I waited a month to call customer support, since I'm still somewhat traumatized by their past treatment of me. After I provided my Amazon purchase order number, the rep informed me that he couldn't help service this unit because in fact, the warranty on this unit had been voided (despite the above-mentioned promise from the supervisor) and their records show that I was refunded for that PURCHASED unit. To be clear: (a) I WAS NOT refunded for that unit--if I had been, I would have received refund to my credit card that I used, not a e-gift card; (b) I would have been refunded the taxes as well as the purchase price I paid; and (c) the order on my amazon account would have shown that this item was returned and refunded, which it does not. So really, what happened is that Eufy customer support made an error on implementing their warranty policy, and to correct it, decided to come after me for remedy, and if I don't send back the refund (which again, was for a unit I legitimately returned to them in good order), they would go behind my back (despite the supervisor's assurances) and void the warranty on my other unit that I purchased from them. This can't even be legal. This is a POOR PRODUCT and it is backed by DISHONEST CUSTOMER SERVICE. Don't do it....