i picked up a set of the CNW bags off ebay a few months ago. The way they are designed, I wouldn't put anything heavier than a rain suit and some gloves in them. The frame has no bottom support, so all the weight is on the rear frame loop. The bags have a pocket that just slips over the bracket, so there's only the strength of the fabric and stitching holding the bag to the bracket.
They certainly look good, and will be useful for day rides.
I've got another set of throw over bags that I use for trips, the brackets from the CNW bags work well keeping the old bags out of the wheel.
Also, if you have a Mk3, the CNW brackets won't work because the seat lock is in the way. My wife wanted to steal my bags when I got them, but fortunately for me, they won't work with her MK3.
She's been using an old set of Eclipse throw over's I had kicking around.
My bike with a set of Chase Harper Bags;