Here is what I posted on another similar thread...
I rebuilt my trashed Hope/Flow Hoops with the Light-Bicycle Wider Carbon rims and DT Revolution spokes & Alloy Nipples. Dropped the weight from 1900g to 1494g (12x135mm x 20mm)... I've been running them for a few months and they feel great so far. I'm pretty hard on kit hence trashing the Flow rims but so far these rims with Bonty rim strips and Conti Rubber Queens/Baron's have impressed me. Quicker to accelerate and they feel just as stiff as the Hoops. One reason I decided to rebuild the wheels rather than replace them was that rather than go for some proprietry 24 spoke design with this set up I still have 32 spokes so if I lose one or two in a ride the wheel won't ping itself to a taco... I'll get to finish the day/ride and replace the normal spoke without having to send the wheel to XXXXXXX to get it fixed. The alloy nipples worry me a bit but in for a penny in for a pound... If they all start breaking I'll replace them but from previous experience with Revs and alloy nipples during my XC racing days (early nineties ) they will last a couple of years before fatigue causes problems (IMHO, YEMV etc etc).
EDIT. The carbon rims are really impressive and very easy to build up as they are very stiff compared to a lightweight alloy rim... like a DH rim to build
Another month has passed and the wheels are still great. I've had to tweak the rear wheel a bit after a fitting a bigger tyre which required the wheel to be dished a bit more to clear the chainstay; it was no problem and I decided to make the tension a bit higher as with the spindly rev spokes at normal tension I could feel the back wheel was a bit flexy when realy working the bike. Since sorting the tension the feeling has gone away so the higher tension has worked.
Not much else to say really. Cost with import duty etc makes the rims about £150 each so double what a Flow costs. If you were to build my wheels from scratch I would guess the cost would be about £500-600 which for a 1500g wide carbon rimmed AM wheelset is probably very competitive (especially compared to ENVE/Reynolds/Easton etc).
Another bonus (for me anyway) is that my wheels look pretty normal...
and since the hubs are Hope standard issue they are reliable, quick and easy to service/change... and reasonably quiet when lubed regularly with oil