We purchased a 16 piece set and we couldn't wait to put it together when it arrived. The playpen was easy to put together and pretty much foolproof. It could go either way and you can't get it wrong when slipping in the panels together. The size was just right, we had 2 panels left as spare and there was enough room for the baby and us in there.
There was enough holes and it was sturdy enough to hang more toys onto the panels.
Highly recommended and will look to purchase more panels in future to make a bigger playpen.