The USR, IMHO, is undervalued, both as a user and as a collector piece. Used values typically range 1500-1900, with near mint pieces bringing closer to the upper end of that range. Considering the original, Swarovski made optics, the USR is the lowest cost entry to a factory Steyr w/ integral optics, and the glass is superior to the current A3/M1 or STG77 optics, which I have read are made by Meopta. (The new glass has better contrast than the Swarovski glass, but is much higher in distortion (fishbowl), resulting in eye fatigue if used for much more than a quick aim)fully.
The heavy barrel on the USR was made by ADI, and is considered to be capable of greater accuracy than standard Steyr- or FN-manufactured barrels.
So, Austrian-made bullpup with original Swarovski optic and match-grade barrel, all for less than 2K seems like a bargain to me! Just add the barrel takedown button and the USR has all of the A2 AUG functionality at a discount.
Under-appreciated, yes, but this results in high value.