Crazyduck:There is another opinion here, mate.
DUI makes the weight and trim system.
Link- http://www.dui-online.com/bc_wt.htm
My wife purchased it for me two years ago and they work out great.
I wear 25-30lbs in my drysuit; 10lbs in the BC and the rest go into weight and trim system.
I tried using some really inexpensive XS Scuba 5lb velcro pockets for a while and they worked, but I was not really happy with the setup. I thought about switching to either Dive Rite or OMS clipper pockets to replace them, but stumbled upon another idea. I stole the rear weight pockets off my daughter's Brigade
They have a zipper top, quick release velcro bottom and hold 10lbs each. This was perfect for my up to 18lbs need. I am using this setup now and really like the convenience of it. Plus the Zeagle pockets are about half the price of the Dive Rite 16 or 32lb pockets as well. I think Zeagle makes a pocket specifically for backplates that would probably work better, but I had these in the house, so I went ahead and used them.
I need to look into the DUI thing though, thanks for the heads up.