Fencer: I'd say there are two critical issues in no limit poker:

1. Sometimes betting order goes out of whack in the first betting round.
2. You can't raise all-in if you have less than bb chips. Also you'll be kicked out of table for not having enough to play if you don't have atleast as many chips as bb.

With low blinds these are just annoying, but with bigger ones it becomes a real issue. These certainly have to be fixed before tournamet play is introduced. In late stages of tournament blinds will be so big that these bugs could have serious effects on the outcome of the tournament.