The only other thing that I was worried about was price. I didn't want to pay a small fortune for them since I was going to need the tallest height (48") and I was going to need two of them. These GoGo X-Pens are only $85.99! That's really a great price. Granted you'll pay a little bit for the shipping, but it was well worth it for me in the long run.
While I will admit that I wasn't thrilled about the doors on them initially, I actually kind of like them now. It does make getting objects in and out of the area a little annoying when you have to stoop down to get through the door, but it's a minor annoyance. I like having a door that will "lock" shut without me having to worry about bringing along clips and what not.
The only other thing that I was potentially worried about with these x-pens was that they originally appeared as though they were all of one piece. I preferred pens that I could open up and connect together to make one more giant enclosed area. It turns out that these ones just have a rod that you pull out and they open up, allowing you to connect more than one. Perfect!