I think Abb's in Melbourne this weekend buying a KinderCot! I forgot to ask her how she went with the p&t one... (we're in the same baby-buddies group). So... FWIW I haven't seen the p&t ones IRL, but from what I can tell the kindercot is just as stable and possibly easier to use as it has no detachable parts or bits and pieces. It just pops up by itself, no need to fit poles or anything. The mattress self-inflates too, and it comes with a sleeping bag. There's even a video demo on the website. Because the kindercot is curved and has curved poles, it seems less likely to tip over, even with my DS kicking like crazy and rolling around in it like a maniac! I'm not sure how it would go with an older bub tho, who's more mobile. There are fabric loops for pegs (not supplied) so if you're using it outdoors you can secure it that way. Hopefully you aren't considering using one outdoors in Canada any time in the next few months?! It's sub-zero!
Anyway, HTH somehow...