When we did our planning from tables they are just the Navy ones for air dives. Gas switches, like some of the other guys mentioned the software programs are good. We do alot of dives at attitude and the VR takes care of that (one less thing to worry about). Like I said b/4 the planning of it is great, just transfer the info to your wrist slate w/ a contengany plan...grab a bottom timer and your off.
I don't use the VPM, just the Bulh. It also gives you the deep water microbubble stops. One thing that kinda sold me was a guy diving in our group blew threw both his plan and his conting b/c he was so narced. The inst. in our group had to go get him (so he also blew threw both plans) The VR got him out of it with no worries, otherwise he would have been pulling out tables and going thru more brain damage in an otherwise difficult time.
P.S. when are we going to start a 12 step program for us scubaboard junkies?
Take the classes, use the tables and a few timers to start. Then once you learn it go for one. Otherwise you kinda speed learn and its just to easy to press a button, have the answer and not know how you got there. IMHO,, either way enjoy yourself