Depends what you mean by folding I guess - folding legs, or one of the tables that folds in the middle?
Personally I hate the ones that fold in the middle. There's a join in the table right where you go to spread the flop, and from experience unless there's some kind of sturdy cross bar underneath them they can be a bit flimsy at the join.
Ones with a solid top and folding legs can vary so just check them before you buy, you should be able to find a sturdy one.
If you're feeling adventurous though, you could try making your own. I know a few people that have done it and ended up with a better table for less money than they would've spent buying one.