Thanks for all the help, I learned a LOT from this thread!!!
After considering all the comments I think that, what would suite the best is a harness that can be adjusted but without the QR. Especially when I have no experience diving in a BP/W setup.
What I really want is a harness as streamlined as possible without any unnecessary toys and pieces of harness dangling from it. After considering all options, there are two possible setups out there:
1. An adjustable harness
2. A standard (single webbing) harness with an adapter to the backplate
The first category I looked at:
Golem Gear G1- suits any backplate and cheap. but, Has a single QR buckle and the crotch strap sold separately
Halcyon Cinch Harness - has great reviews and easy to use. but, expensive, Has to be used with Halcyon Backplate and a more complex mechanism - more failing points.
TECLINE Comfort-Harness - Very expensive and Has dangling endings but, Fits any backplate
Subgravity Adjustable Harness - expensive and Has dangling endings and QRs (Very streamlined QR buckle) but, fits any backplate
AGIR harpa - relatively cheap and easy to setup. But, does not include D-rings, buckles, etc… (will add an additional cost and hassle) and works best with low friction webbing
OMS SmartStream - Fits any backplate, streamlined but has an additional buckle on the side and not cheap
In The second category I looked at
Cinch Adapter for Tecline Backplate - has to be used with Tecline Backplate (or drill your own holes)
How it will work with a Backplate Pad??
Subgravity slider - Very simple mechanism, extremely cheap, fits any backplate and no dangling endings
Backplate Slider - Very simple mechanism, extremely cheap, fits any backplate and no dangling endings but, an an known manufacturer, unknown quality
So, in conclusion from the first category I like the OMS SmartStream and from the second category I liked the
Hog Hogarthian Harness Basic with the Subgravity slider.
I'm leaning towards the second option (Hog Hogarthian Harness Basic with the Subgravity slider). It is an inexpensive, robust single webbing harness and, I can always remove the adapter
Did anyone tried the Subgravity slider (or any other adapter)? What would you choose?
Any other possibilities I missed?