I think he's worth a gamble, especially if you need help at QB. He's not Vick fast, but he is going to be a stud, and it could begin as a rookie. He has better weapons to work with than Vick or McNabb did. Not as much support as Culpepper had his starting year (2nd year).
Grab him now if you need help. I don't think he'll last long if he does explode. When Jimmy Smith gets back week 5, he could be set up well.
The meek ain't gonna inherit $#!%....'cuz I'll TAKE IT!