NWGratefulDiver:Backplates ... in my current inventory I have Dive Rite, FredT, Koplin/Oxycheq, and DeepSeaSupply (DSS).
In order of preference ... DSS, FredT, Koplin/Oxycheq, and Dive Rite.
The DSS and FredT plates are about equal quality ... which is very high. My preference of the DSS over the FredT is due to three things - (1) bend angle, the DSS is a much flatter plate, and I prefer having my cylinder as close to my back as I can get it (your mileage may vary); (2) the rubber grommets in the strap slots prevent your harness from wearing out ... and for someone like me who puts 300+ dives in a year, that's worth considering; (3) DSS has a nice system of plate weights that screw right into the back of the plate for those who want to put more weight on their backplate.
I prefer the Koplin/Oxycheq plate over the Dive Rite because it's a bit shorter, and has more rounded corners ... which makes it fit my body better. The corners of the DR plate tend to dig into the hips a bit, and when I used it on a regular basis I ended up with some wear marks on my drysuit from the plate.
To respond to the originator's remarks ... I would shop around a bit before buying. Halcyon makes good gear, but their prices are higher than some equally-impressive alternatives.
... Bob (Grateful Diver)
Thanks for the comparisons.