One more vote for clipping off an SPG to your left hip and being done with it.
I know that some people really like to watch their gas pressure on their wrist, I personally don't find that is much of an advantage. Also, some people are data junkies (like me), and I kind of miss having pressure data in my downloaded logs, but that has become less important to me over time.
The extra hose is virtually unnoticeable, and I constantly had problem with the WAI link on my Suunto Vyper Air. I don't think that it was just me, either... read the threads here and you will find a LOT of people with the same experience. So if I don't really trust the WAI, what's the point of having it? Yes, I know that there are lots of people who have never had problems with it, but the point is that a significant number of people have had problems with it.
Statistically, if nine out of ten people have had their WAI work perfectly, that will generate a lot of posts vouching for the system, despite an unacceptable 10% failure rate (made up numbers for the purpose of example).