I bought a ferplast casita 120 and would say it has good and bad points. The good - has an ok side door for the piggies to come out and for you to reach in, but not wide enough to grab a scuttling piggie who doesn't want to be picked up (pigloos and fleece hidies are good helpers in that regard). With the door I'd probably put a little greece or something on the mechanism as the sliding metal can be a little tight when you first buy it and the scraping noise of opening it scares little skittish piggies!
The real bonus is the top opening of the entire cage. I have actually taken off my cage top opening door altogether as the piggies can't jump out. It makes for an easy cage to clean or to pick up your piggies as you can lean over and get access to the whole thing. Full side opening cages are great because you will be interacting with them at their level, but they aren't always the easiest to clean in the back corners or pick up piggies in the far corners from the side opening. An open top is great as you don't have to crouch down on knees to reach in and can also easily access any part of the cage. However you are leaning over the top and not at piggie level, so it might take a little longer for skittish piggies to get used to you at that height. Not been an issue for me as my piggies love to nosey around my hands at cage cleaning time - they know new hay is on the way!
Other good things - water bottle and clasp secure are fine and work well - better than the attach a stout wire ones you get from the pet shops. Negatives - the plastic ramp / hidie home is pretty naff - something which is true of most of the commercial plastic cages really. The ramp itself is non-existent and steep - young or much older piggies might have a difficulty getting up to the platform. Also the area under it for the home has such a small entrance that it is a bit tight for two bigger piggies to come and go. Plus it creates such a dark corner area that your piggies will hide in there and you won't be able to see them at all. And it's difficult to get them out from there safely to pick them up. But if you ditch the ramp and put in your own hidie places for them then most of the negatives of this cage are taken away!
If you want something that is easy to clean at 120 size, but more portable than a C&C cage setup then you'll be good with this. I bought mine from Zooplus who had it cheaper than anywhere else. Hope that helps.
