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SA Boy:Haven't used the SeaQuest Pro QD+ but I do own a Seac Pro Tech.
I really like my Pro Tech but if I had the choice again I would buy the Seac Pro 2000 which won a heap of awards here in the UK when it came out including "Dive Innovation of the Year" from diver magazine.
The tank strap on my Pro Tech isn't anywhere near as good as that on my old SeaQuest (1985 model) but I've never had any problems with the integrated weights and there are some pretty nifty design ideas on both the Pro-Tech and the Pro 2000.
I asked a few people I know have compared Pro Tech, Pro 2000 and Seaquest QD+ when they were buying and they all went for the Pro 2000.
There is one model above the Pro 2000 called a Pro 3000 but it's not worth the extra money.
Good luck in your choice.
Philip