T.M.
My 20 month old escaped his crib a couple of months ago. We have a crib that converts as well, but he's a climber! I didn't trust him in his room with a dresser and changing table (and the fact that we use his room for storage when we need to). We decided to go for the tent. After spending an entire weekend searching all the store I could think of, we ordered 1 from amazon (it's the same 1 One Step Ahead sells, but cheaper). It's been great. He's had no problem with it. He even tries to close it himself. The only problem is that the velcro tabs are not long enough for the sides of our crib. I had to go to the craft store and get heavy duty velcro to extend the tabs. It took my husband about 45 mins to put them on.
Here's the link to Amazon. BTW, it came in w/in 4 days.
http://www.amazon.com/Tots-Mind-Cozy-Crib-White/dp/B00014...
Good luck!
T.