It is hard to find a pair of isolating headphones that won't rob the bank leaving a bitter after taste, a feeling of being conned, misled or otherwise suckered into filling another segment of that rapidly filling cupboard you so do not want the wife to find out about, you know, the one that is festooned with average, over priced abandoned audio kit.   In this case, the the phones were on special at £25 (retail normally £80) in Sainsbury's (a national supermarket).   Sennheiser is a name that is relatively reliable though that cupboard has a...