Just a note that the Iris stuff is pretty awesome. We have a white playpen that has a little door on it (not from Woot, but I did buy it from yer daddy Amazon!). Extremely easy to put together, take apart and lay flat, and very good quality. Even ordered two additional panels to give our pup a bit more space.
Oh, and to answer your question Ms. Thighs - Our pup came pad trained from the breeder. No idea how they did that. He misses sometimes, but mostly on target. Now we've got to start moving them towards the door!