I like Rel's high level connection a lot..
I ummed and arred between GS and the vintage RS1's for a while.. i think the RS are meant to sound warmer but the GS, due to their larger pads have a wider soundstage with more bass.. i'm more than happy with the GS and i got them for a very good price.. the seperation is like running a £1000 DAC but if a pair of RS come up at the right price.. i still might buy them, Pepsi challenge them both with the type of music i listen to, choose one and sell the other... the open back means everyone in the room can hear what you're listening to.. if my missus was reading a book in the same room, i'm sure it would be irritating but i only use them because i like to bang music out which can be a bit anti-social if it's late.