Well, they look pretty solid which is more than I can say for some of these kinds of deals. It says right out the roof is 3/4 inch plywood with roofing paper and shakes on it, that alone is better than most of the bare plywood tops I've seen on these, and the whole thing seems tight.
The pens are simple and while I could see how they might be a bit awkward, they're still utilitarian. I kinda disagree about ease of putting in feed etc, I think I'd stand within the door to do that which means you'd be ok balance wise, but I do agree about hens getting out very easily when you do so. I guess since you could only have a few hens at a time in any of these, it'd be easier to manage, but I only have 12 at the moment, and mine can be quite a handful if they want out the door badly enough. I don't normally care if mine get out, but in a city situation where you don't want escapees, of course they WOULD be making a break for it at every chance, that's just what they do!
The bigger thing that would worry me about the pen though is it looks fine for keeping the hens in, but really, a dog that wanted IN, would get in just by jumping against it hard enough.
I'm looking at these and thinking how easy it'd be to build these in a modular sort of way... Even with my very modest carpentry skills, I could do this I think, and I think I will use some of the concepts I see here to assemble a duck house which I want for this spring... there's really no way I'd pay this kind of money for one of these, that's just me though in my situation. If I had more money than time instead of the other way around in my case, I really might go for one though, they seem pretty ok to me!
Hope this isn't too rambly to be useful, I was sort of brainstorming while I typed.