Yeah, it probably would have been the better buy. It made the pro form a lot more complicated and actually jacked the price up quite a bit having to buy the airbag separate from the pack. I can't really complain considering the price I paid. I might order the 35 liter pack later and sell the 30 liter one without the system for a ridiculous price.
What I really want is for those guys to add an insulated hydration shoulder strap. Freezing is a big issue here with our cold ass temps. The insulated shoulder strap is the only thing I have used that stops it from happening.