...my very 1st BC was a Ranger....which I still have, it's still in very good condition, although admittedly that's partly due to the fact I retired it to my back-up/emergency reserve gear closet. The Ranger is a good, all-round, starter BC, and back when I was new diver...and didn't know what all I didn't know, it seemed like a good idea. If a new diver came up to me and asked for a solid, basic starter BC suggestion, I wouldn't have a problem suggesting the Ranger. That being said, don't look at the Ranger as a 'tech' BC......sure, on paper, you can tack on/modify/jury-rig techie bits/pieces onto it, so that on paper it kinda specs-out as a tech BC....but it's gonna be like putting an Indy-car engine in a '74 Ford Pinto and calling it a Ferrari !
I'm still not sure why so many new divers. many not even certified yet, are already planning to dive the Andrea Doria eventually.......there are about a bazillion things about diving you don't know and you may not even have the experience to realize the universe of things you don't know....my suggestion is to pick up a good used Ranger on E-Bay, dive it a while, get some experience, upgrade later......the vast majority of divers do this anyway.....you can't possibly know where you will be as a diver 5 years...10 years from now....don't let the perfect be the enemy of the good....go ahead, and get the Ranger now (used) (new ones are $ 700-ish) and get some diving experience and worry about later...later!
It took me a far amount of real world diving experience (not reading on the WWW) to REALLY understand what I wanted out of my dive gear.......which lead me to designing/building my own custom designed BC/wings. ......and now when I look back at my Ranger, compared to what I'm diving with now, I look back and ask myself....what the heck was I thinking back then? ....again, the benefit of hindsight.
......the Ranger is in no way/shape or form tech-suitable, IMHO.......the pockets are oddly shaped and very tiny, essentially useless......it's got a goofy optional 'saddle-strap' crotch strap, which is definitely NOT something you'll see on a tech set up.....D-rings fixed in place/can't customize them.....and something I really hate....it's D-rings pivot/swivel, I MUST have fixed 'bent-D-rings' that don't push/fold away when you try to clip off a light/gauge/etc........and try to mount a can light on a Ranger and see if you can find out how to do that! While I never had any problems with the Ranger weight system (at least it isn't based on velcro...anyone who designs a velcro based weight system into a BC should be SHOT!)...I'm still not crazy about the Ranger weight system....and if you shop across all the common tech brands...or recreational brands, for that matter, you'll find nobody else uses that weight system design.
Buy the Ranger now so you can just go diving and get needed experience...but don't expect to be able to use it in a 'tech' environment....'tech' instructors tend to be very strict about acceptable gear for their classes, and the Ranger won't cut it......it's a passable recreational BC...tons of recreational divers use them successfully...it's a mature,safe design.