I've found (after many bad buys) a pair of cheap bluetooth headphones that 'just work' with my iphone. The problem is, there is no way for a customer to tell wh

I've found (after many bad buys) a pair of cheap bluetooth headphones that 'just work' with my iphone. The problem is, there is no way for a customer to tell whether a bluetooth device is going to work well or not (or even not at all!) Bluetooth can be good but there are just too many devices which are 'bluetooth compatible' in theory but have many odd incompatibilities. Perhaps it is the complexity of the spec that causes this to happen to bluetooth, rather than wifi...