I'd be interested in using one but the price is prohibitive. In saying that if it was your main 'sound' and did a lot of live and recording it would make a lot of sense. Big warm tone, pedal board friendly etc. I had considered selling my main pre to get one, I play about 40 gigs a year give or take and if I sold my main pre the Noble could replace it.
Be interested to hear what its sounds like into a power amp. I'm supposing it could drive a power amp I'll pop over to the Noble site for a read!