Hi, Dakajoba; in comparison with certain other LOMC cartridges in the Eroica's price range the Eroica H isn't going to have the same level of resolution and detail. For example, I also run an Audio-Technica AT33PTG with a mmf-7 and the differences are noticeable. The 33PTG is more refined and extracts details from a record that the Eroica H does not. But the Eroica H has a more lively presentation and more "jump and jive" in the presentation. It highlights the mid-tones a bit more than the extremes. Another LOMC cartridge I've used with the mmf-7 is the Dynavector 20XL, which has the resolution and detail of the 33PTG (actually more so) but adds more authority in the bass frequencies (more slam) and so has a more robust presentation. It has an airiness similar to the 33PTG with the liveliness and jump factor of the Eroica H. It's all relative so to speak and I'm not talking about huge differences.
The Eroica H is a fine cartridge for a range of mainstream music genres and does well with acoustic folk/rock; The Byrds, Ryan Adams, Bruce Cockburn, Grateful Dead, Emmylou Harris and Joni Mitchell as examples. Voices and stringed instruments will sound quite natural. You just won't hear which brand of guitar strings Mr. Cockburn plucks or the model of microphone that Joni's using at the time. '-) Would I spend $750 to buy an Eroica H nowadays? Maybe, maybe not. Goldring cartridges are not as competitive as they once were here in the U.S.A. but I certainly wouldn't go out and immediately replace an Eroica H if it shows up on a mmf-7 turntable.
You could always try another cartridge after you've listened to the Eroica H for a while and have a better sense of how it sounds and what you like or dislike about it. Then you'll know what characteristics you want in the next cartridge. Also consider that the phono preamp will make a big difference.
To give you some perspective on a "good deal", I would consider $400-$600 USD (depending on age and condition) a reasonable price for a used but well cared for mmf-7/Pro-Ject 9 and an Eroica H with 500-100 hours or so. The mmf-7/Eroica H combo was available for $1000 to $1300 (with the turntable alone selling for $900-$1100) and unless the turntable and cartridge are in excellent condition, I wouldn't pay much more than about $400-$600. I've seen (within the past 6 months) mmf-7/Eroica H combinations for sale in that price range. Music Hall's upgrade to the Pro-Ject 9cc tone arm put a damper on resale values for the mmf-7 with a Pro-Ject 9 aluminum arm; bad for sellers but good for buyers.
Tom
PS: If you haven't heard a turntable recently you should. Before spending much money I'd try to listen to a few vinyl setups so you have a comparison to CD playback. I've always enjoyed having turntables and vinyl but they aren't the end all some people claim them to be. A decent digital setup can sound comparably good without the inconveniences (quirks) of vinyl. Just be sure you're ready to retry the "vinyl experience" before commiting the cash. (I'm likely preaching to the choir. '-)