most all regs are light and breath very well something that should be just as important is can it be serviced where you are. If you can talk to your service tech he can tell you more about regs than any diver out there. some companies are very hard to get parts from so your reg could be in the shop for awhile. I have had a very hard time getting parts from dac/mar and some have alot more parts than others so talk to service guy not the sales man on regs