A.B.
We put my little guy in a toddler bed at 15 months (mainly due to me having back issues, and I couldn't lift and lower him in the crib). He did great with the transition. Yes, they do get out of bed more often... but when we put him down, we leave his door open and put a gate up. He might cry for a bit, but then he usually just goes back to his bed to go to sleep. When we go to bed, we close his door.
This has worked really well for us.
Good luck!