SuPrBuGmAn
Contributor
No such thing as a "technical BCD" really.
Trans-Pac is a "neither fish nor foul" sort of setup: has most of the drawbacks of a recreational BCD, and lacks most of the benefits of a BP/W. If you're going tech, get a straight-up BP/W setup and be done with it.
"Buy it right, or buy it twice."
Unless you think sidemount diving is in your future(and it certainly has benefits in different overhead environments). Your BP/W won't help you there, and you'll have to buy it right... again.
The Transpac easily becomes a Nomad with a few add-ons. It works with backmount doubles and singles, for pretty much any diving.
"Buy it right, or buy it twice" doesn't apply to all types of diving. Get the right tool for the job or at the very least you can buy a tool that works well enough for several jobs.