I am on a complete second season on my Topos and still very happy with them. I am 175 lbs and have only had two issues with them.
One is nipple breaking, I think I have had 3-4 nipple s break in 2 years of riding.
The other issue is the hubs become loose. I sent them back to Topolino, and they repaired them at no expense to me (other than shipping them there) and I think they were out of warranty.
Also, even if the nipple breaks, I have been able to ride the wheel back to the start of the ride without problems. I just open up the brake. Since the topos have more spokes than regular light wheels, they don't seem to go out of true as much.