I bought similar from ebay, but for a lot less than the one your looking at, shop around.
Only thing I experienced is that due to the Desire having a "chin" it stretches the case to make a very tight fit (hey it's silicone so it gives) and this only shows in that the power switch recess in the cover is slightly offset from the handset. Doesn't hamper anything though
HTC Desire (Oxygen 1.0.4 - Radio 32.44.0032U_5.09.05.30_2)
Advent Vega (MoDaCo custom rom R6 + PP)
Mda Compact IV (** EnergyROM Series "Warhawk" 23016 ** R18.104.22.168)