I've read a lot of reviews before and after the Optoma buyout of NuForce and they have all been pretty positive. My personal experience is restricted a couple pairs of IEMs and a uDac-3 (pre Optoma) and really liked them. I also have a pair of wireless IEMs (post Optoma) and they are fine.
I believe they are now now broken up into two companies: Optoma NuForce for mid grade stuff and NuPrime for higher end. I had my eye on the NuPrime IDA-8 integrated when I was in the market, but because of a so-so past experience with another audio company, I am still not quite sold on class D amplification... That being said, the NuForce stuff, for the price, is excellent.