I transitioned my dd at 8 months when she rolled over in it, I actually rang the company and he said that if they are not climbing out and not to heavy for it they can stay in it till around 2.

When I transitioned dd to a cot, i had to rock her till nearly asleep the first time but after that she settled herself in about 10 min, winging but not crying. Within 2 days she had transitioned with out anymore help. Now she self settles in it with out a problem.