Pros: Easy set up. Durable; washable base. Zippered top & side access doors. Medium and lg sizes have room for 18"-22" scratch post, food dish, litter box, cat bed. Many sections have mesh covering for good airflow & viewing purposes.
Cons: Only one zippered side-access doorway (I wish there were two side doors). Human must learn certain tricks to prevent cat from becoming a leaping or darting escape artist when the human is accessing the pen via the zippered openings (top and side).
When our cat went through surgery last year and we needed to have a crate to keep her contained for 8 weeks during recovery, we decided on these Pet Gear soft octagon pens. We bought two medium-sized ones (36"x36"x21" high) and actually devised a way to velcro and clip together the two medium "pods" at the side door juncture locations, to create a sort of double-podded, bigger "crate" (two octagons joined together). On one side of this set-up, we had her litter box and a blanket; on the other side, we had a cat bed, her smallest scratch post, and this 2nd "pod" was where we fed her and gave her access to a water dish. Whenever we wanted to clean her box, feed her, give meds, or bring her out for short time periods, we accessed this "pod system" using the top zippered access for each side (since the two side doors were velcroed together). It would have been handy if the octagon crates had a second side (vertical) doorway access built in on the opposite side of the normal side doorway, but they don't have this. (Maybe some day they will be designed with two side doors!)
One negative is that if using the top access to reach in to get the litter box out, or to work with the cat (e.g., giving meds, etc), the cat can learn that it can jump up and escape out of the pen if you've unzipped the top wide enough. Some of this is remedied by only unzipping a portion of the opening that is needed, and preventing the cat from having a larger opening from which to jump out. But as our cat got more active 5-6 weeks after surgery, she tried to escape more.
To give her some benefit of moving around our apartment during her "confinement", we also bought the smaller sized soft crate, which is 29"x29"x17" high. This is very portable, and we were able to move this onto tabletops, into sunbeams, to other rooms, when needed. We would move her to this smaller "pod" when we wanted to really clean out and/or reorganize the two "conjoined" pods. Our cat actually still loves this smaller octagon crate, plays in it, sleeps in it at times, enjoys being in it (all with the door open) -- we also have this small pen handily nearby if we need to briefly confine her in order to vacuum or if she needs to be contained when people like plumbers or the cable guy have to come over. The soft crate gives her "a safe place" where she can hide and yet still observe the goings-on around her.
These crates are not meant for long-term confinement, and we used them for the purposes we did (post-surgery) because we were always with her during her recovery from surgery. They are very durable and can take the punishment of a cat pawing at the sides and top, but you really don't want this type of soft crate for more permanent or unsupervised confinement situations. However, if you don't like plastic crates with metal bars, this is a good option short-term. These pens would be great to take on road trips, when you want to safely confine the cat during particular situations, etc., short-term.
All-in-all, no buyer's remorse whatsoever, and we can store them easily if we find we ever need to use them again.