Our opinion of Musical Fidelity is not a good one, they are just ordinary mass-market amps that have user manuals written in simplistic patronising terms for the Muppets who buy them & keep them thinking they've bought well & never have used more than 50w max of the 250w! They are like the Pioneer SX850-950, big impressive show-off items that don't deliver the real sound. If you've not heard better you won't know they are just ordinary.
That said, at a similar power I very much doubt you could tell the difference between it and your NAD.
The person who wrote that also is a huge vintage tube fan and if you care to read the other pages, his last recommendable good amp was in 1985! Everything else after 1977 or 78 except one in 85 is no good. He also said anything that is heavy, or with a very low THD or >50W isn't good design...
I happen to have the MF 308 but the integrated version AND the Arcam C31 mentioned on the same page: I guess I should have jumped off the bridge by now!
Audiosceptics accept audio trials using 25 people. A recent Oxford study with over 353,000 patient records from 639 separate clinical trials shows for every 1,000 people taking diclofenac or ibuprofen there would be 3 additional heart attacks, 4 more cases of heart failure and 1 death every year.