I have been looking into buying a pair of Bose QC2 headphones as a freind of mine has them and I was very impressed with the sound quality. However, I have been reading here that the Sennheiser PXC250 have offered favourable competition at the fraction of the price. I have just been looking at the PXC300 offered at £109.22 by HifiBitz and wondered if anyone has tried these yet? Being the next model above the 250's I am guessing they could potentially prove an even greater rival towards the Bose. Does anyone know the difference between the PCX250 and the PCX300?