Of course, these dives are for divers that have already proven themselves. Yes Papa Hog's does stop at beaches on SI's and so do the majority of dive shops in Cozumel. Papa Hog's owns many six pack fast boats some with canopy's and some not. The slow boats are the one's that might be of concern whether or not there is a canopy. The fast boats get you to the majority of reefs usually in less than 30 minutes, of course this time is depending on what reef.
Most dive shops encourage the use of computers and most experienced divers have their own.
Most dive shops prefer not to use the 100cu.ft. One reason being the possible rust problems associated with using steel tanks. Which Aldora has had problems with in the past. The pro's and con's have been argued back and forth all over the scuba forums. Still most dive shops stick with the 80cu.ft.