I have an MMF-5.1 and agree with the claim that it's hard to tweak. Adjusting the azimuth was a real pain, and I still think I don't have it right. Instructions say that VTA, azimuth, and cartridge alignment are setup at the factory. Don't trust that claim; my cartridge was not aligned perfectly, and neither was the azimuth. Who knows if the VTA is perfect either.
With that said, I believe this TT is a bargain for the way it sounds, but I haven't heard many other tables to make a real comparison.