Always worth a listen for yourself if you can get in somewhere - good alternatives to listen to for comparison are Graham Slee Solo SRG and/or Solo Ultra Linear and Lehmann Linear - all great headphone amps.
I auditioned the Musical Fidelity HPA today with both headphones. Not really impressed. I like the Headroom Micro DAC and Amp ($300 each) better, IMHO.
Just wondering what the graham slee solo/novo sound like...