Hi! I love our crib tent!! I started using a crib tent on my son's crib when he was 20 months old in Dec. and he threw himself over the rail 3 times in one night. (The mattress was at the lowest setting and the rails were up.) We went out and bought the tent the very next morning. It's been worth every single penny, as I'm sure it has saved him from an injury.
I know that if I was to try to transition him to a bed, there is no way he would stay in it. My son needs his healthy sleep -- not nightly bedtime battles. He will transition to a twin sized bed when he turns 3 (and we won't need to buy a toddler bed!)
Twice since I've purchased it, I have forgotten to zip the tent closed. Both times, he has NOT climbed out! It's as if this tent helped him transition back into the crib, and he loves being in his crib again.
Here's a web link to the crib tent we purchased in December.
http://www.amazon.com/gp/product/B00014PLAY/ref=cm_cmu_pg...
There no way a child could tear down or get out of the crib tent we purchased -- the crib tents today wrap around the outside of the crib. No safety issues at all.
It is wonderful to sleep soundly, knowing my son is 100% safe again. Please feel free to send me a message if you want any more information about the tent or our experience with it.