Cracked Conch,
I agree, try as many different BC's as you can. And ask, ask, ask questions and get opinions. Then get the BC that is best for YOU.
My experience, fwiw.
I own and use the transpac. I like the bc alot now. When i first dove it everything i did in the water seemed awkward. Most likely because i had only dove vest style BCs prior to that. After about 10 dives worth of moving weight around the rig was ballanced. I can practically unhook the waist and torso straps and dive as if the rig was secured fast. It just stays wherever i put myself. But this took a bit of work to get ballanced. Diving it with an AL-80 increased the work i had to do orientating myself from vertical to horizontal. With more weight on my back i found the rig dove much better.
The first time i dove the rig the weight was way to far forward. When i surfaced i filled the wings. (2 mistakes!) i ended up face down on the surface trying to spot the boat in 4 foot seas. Needless to say this was not fun - and diving should be fun. I found moving weight back on the waistbelt helped me stay more vertical in the water, and not filling the wings all the way up stopped the bottom of the bladder from lifting my but up and pushing my face down. However the weight being so far back made it hard to stay horizontal below the surface. With more weight high on my back the rig ballanced out. Eventually i found the sweet spot at which everything was just right.
One other BIG mistake i made during this process was diving the rig with a weight belt and loosening BC on the surface. When i dove a vest i could do this and not have any problems. the arm holes kept me high in the water. With the transpac i sank down a few extra inches where it's hard to breath without gills.
When i bought the BC a big concern i had was not ending up buying a bunch of them over the next couple of years as i progressed. I picked a system that was versatile and knew would suit my needs for a longer period of time. I can use doubles, or single tanks - add/remove pouches clips nad rings - dive with nothing attached in the beautiful tropics, or technically in the less colorful North Atlantic with tons of stuff clipped to me - and so on.
So i am happy with the rig... Customer service? Well... I have heard great things about Zeagle, and am less than impressed with Dive Rite.
Hope some of my expierences helps out, Sean