We bought this for our senior dog when she started having accidents in the house. After she passed, we used it for our new baby when he was adopted. Hes two now and he still runs to it when we are leaving the house (hes a terrier, so is not to be trusted )
It is just so much nicer than putting him in a crate, even a large one.  This has held up really well and we love that its easy to adjust the size of the pen by folding panels back on themselves. Stable and safe for the pups, no sharp edges or any problems.