Hi, Dakajoba; is the mmf-7 turntable the original mmf-7 with the aluminum Pro-Ject 9 tone arm or the upgraded version with the Pro-Ject 9c or 9cc tone arm? Depending on which tone arm is included it would make a difference in what the turntable is worth. I've been running mmf-7 turntables for years and even after upgrading to a much more expensive turntable setup I still listen to the mmf-7 occasionally when I want a change of pace. (No pun intended.) As to how it compares to the Thorens TD-166 Mk2 I cannot comment since I've never heard a TD-166 Mk2. But if the mmf-7 and Eroica H are in good shape and (depending on the tone arm that's included) the price is a good deal, I don't think you'd be dissapointed in the mmf-7.
The Goldring Eroica H cartridge now lists for $600 to $750 but it came included with the mmf-7 for much less so don't put too much value in the cartridge as a package. That said, the Eroica H cartridge is a fairly decent moving-coil cartridge. Not the most detailed or the most dynamic but the tonal balance is good and it conveys a lively and robust presentation of both electronic and acoustic instruments and an involving portrayal of (singing) voices. I wouldn't choose the Eroica H for symphonies or to hear the nuances of quiet chamber music but I find it to be an all-around "fun" cartridge for rock, blues, bluegrass, etc.