The 'D' batteries are middle of the road for run-time, but for the price perform very well and for me are worth it. The problem I have had that I think bears consideration is with shipping.
My first order was packaged with no padding, so I ended up receiving 24 battery shaped wrecking balls and shards of packaging in a box. I didn't feel comfortable using them, but Woot! did refund in full.
Reasoning that when they came up again the problem would be resolved, I tried once more. This time the 3x 8-Packs were padded in the box, but two of the packages were once again damaged to the point that batteries could fall out. One of them even had Scotch tape over a break in the plastic, indicating that at least some of the damage had seen an attempt at a repair before shipping!
The bottom line is that because these are clearly going to arrive in less than pristine shape, you need to decide whether that condition will be acceptable. Since my recently purchased TDK SoundCube takes an extreme 12 of these buggers, which would be very costly with 'D' cells from a more standard source, I resolved to just not store the batteries in the unit and only install them when I need to use it. That way if the batteries leak or something over time due to damage in shipping, at least my expensive gear won't pay the price...
