Alexandra, I agree with the two people that advised you to keep him in the crib. My oldest son was 2 when my 2nd boy was born, and I didn't mind having two cribs, but my husband insisted on moving him to his twin bed, which he already had, and I didn't oppose because he was such a wonderful sleeper that I thought that he will do all right.
Well, that was the beginning of our nightmares, for a almost a year and a half we struggled with him, not wanting to stay in the bed, wanting to sleep with us, which we didn't want. He would wake the baby up, crying because he didn't want to sleep in the bed. So, a friend gave me her crib, but it was already too late, even with the tent, he didn't want to stay, and he used to have the tent since he turn 20 months old.
Now he just turned 4, and finally, I can happily say that after 6 months of fighting it ( and nobody having a whole night of sleep), and another year of giving up, and letting him sleep with us (in our room, next to our bed in a sleeping bag), he is sleeping in his bed, and his two year old brother is in his crib in the same room. They keep each other company and I am not planning to take my little one out of his crib until he is at least 3 years old.
Each child is different, and maybe your son will do great in a bed right now, I have friends that never had any problems, but after what I experienced I will be in no rush to take a toddler out of the crib, they feel cozy and secure in there.
So good luck with your decisions, whatever you decide I hope it works best for you and your son.