I spoke with the wizard of Disc Drives, Bicycle Bob. He said on the older (36-hole) versions that Tomac was thrashing, they limited their life to 15 hours. Thats race hours under Tomac's legs mind you. The 32-hole versions were less than that.
That being said, Rumpfy of MTBR says he's used his for many seasons with no worries.
First one I got was a Sugino. It was roped and never trued up.
Followed by a 'blue' disk that never trued up.
I finally landed a NOS 32h radial laced disk wheel that I had built from scratch. I rode this one for several hundred miles, raced, and 'aired out'.
It would need truing every so often and would always fall just slightly out of true, but hold.
Just recently the tiny nuts that hold the wheel to the hub flange on the inside started coming loose. The wheel gave notice by creaking and groaning and falling way out of true. Had it rebuilt again and I've only got one ride on it since....it's fallen a bit out of true as usual...we'll see how it holds up.
They make for a pretty heavy wheel and side to side flex is excessive. You can flex it to the brake pad when you hammer out of saddle and put enough power to it. They don't stay true and don't last very long...
Seems for every good experience someone has with one of these wheels, there are four bad ones.
All this being said...they're just so f'ing cool I don't care that they're expensive and work like ass.
The sound is the best thing ever. It just makes you ride fast. The attention and double takes they get is pretty fun too.
I don't even want to think about what kind of money I have tied up in mine...but I'll continue to ride them. Can't not.