So, I figured I would share my experiences with IRD Cadence rims. This set was built for a disc-brake cross bike I have, to replace a pair of Mavic Speedcity wheels. Also of note, I have significant wheel-building experience.

First, here is the build:
XTR 965 centerlock disc hubs, 28 hole/32 hole.
IRD Cadence rims
DT Revolution Spokes (2.0x1.5x2.0)
DT Alloy nipples

Lacing was 3x on front and back.

Build-up - These went together reasonable well. Roundness and trueness out of the box was OK, not as good as more expensive rims like Velocity Aerohead, but still pretty good. They are really light! One gripe I had was that alloy nipples didn't seem to turn freely in the eyelets once tension was high. They felt "sticky," for lack of a better word, despite the nipple, spoke, and eyelet being well-lubricated. Bummer.

Durability - The front wheel has been durable. Tension was even between sides and it only needed a tiny touch-up after a couple miles of riding. The rear wheel is a different story. In hindsight, I should have built it with an offset rim, but I am not sure that would have helped much. It has needed truing 4 times since building, despite even tension around the wheel, which includes about 1000 road miles and 3 cross races. It is also lacking significantly in stiffness. The rim around the eyelets shows some distortion around the eyelets, especially on the DS, which doesn't bode well for the longevity of the rim. Perhaps I am a rider who is too heavy (165 lbs) for the rear rim to handle.

Overall, I would give the rims a "4 out of 5 stars" rating. For any more builds I do I will pay the extra money and stay with the Aerohead. It builds to a stiffer wheel, and despite the lack of eyelets seems more durable.

Plus -
Cheap
Very Light
Eyeletted (some consider it a plug)
Straight

Negative -
Durability
Stiffness