I have the XM5, previously had a Yamaha AS801, which was excellent, different to the Exposure though. The Yamaha was very powerful with huge dynamics.
The exposure is more musical, more detail. I've had few Exposure amps in the past.
18, 18 monoblocks and a Model Super eight. I really like them and regret selling them.
The reason I went for the XM5 was because our new tv unit won't accomadate full width units. The XM5 could do with one more analogue input though.
Ron