I have a pair of 7000s - absolutely gorgeous, will never part with them - but they need the right amp. Mine are biwired to a Camridge Audio A500.
Strengths: Soundstage (when set up and driven properly) clarity (particularly vocals) & dynamic range. The bass is virtually bottomless.
The one big weakness is that the ribbon is highly directional. Your ear needs to be in the same horisontal plane as the ribbon which means they're not so great for parties.