My current Benz-Micro ACE low or Koetsu Black?

I upgraded from the Benz Micro Glider 2 (the next step up from the ACE) to the Koetsu Black.

I felt it was a worth while upgrade myself, however, I will point out that there were trade offs.

First, the Koetsu takes at least twice as long to break in.
At about 100 hours, it is mostly broken in, but it actually continues to break in until about 200 hours.
Once it is fully broken in, it has about the same low frequency response as the Glider. The Glider has a bit more high frequency extension, but, to my taste, this was a negative, as I felt it was a bit too bright in my system. Not quite fatigueing, but just a bit too hot for my taste, if you know what I mean. (I find a system that is too bright to be annoying.) However, if your system sounds a little dark, the Benz might be better in your system.

The Koetsu Black was always a treat to listen though. The Koetsu mid-range magic was there. For some, they consider it to be too much lushness (Kind of like having too much of a tube sound bloom, if you know what I mean). I run an all solid state system, so for me, it was just right. I will point out that if you are a bass fanatic, the Koetsu line is probably not for you.

When it was time to upgrade, I upgraded to the Koetsu Rosewood Signature, which extended both the HF and LF range, as well as tightening up the imaging a little bit more. The bass is still a little loose, but a bit better than the black was.

Hope this helps. Good Luck!

PS Not to be self-serving, but at some point in the near future, I will be selling my Koetsu Black, (assuming my friend does not buy it), which has about 200 hours on it. If you are interested, let me know.

I personally feel that you can do better for your money by upgrading the table before spending that much on a cartridge.

I heard a Benz Micro Ace a while ago and found it quite balanced and musical and entertaining. From what I subsequently read, it's actually a better-balanced cartridge than the Glider, and more satisfying in the long run, in this sense (musicality and balance) also "magical". I agree with Twl, your money is better spent on upgrading the 'table, or on more records, the Ace is a class act.

Koetsu catridges were designed on idler-wheel turntables, which have very powerful, tight bass, due to their great torque. I suspect that mounted on such a 'table (or a large direct-drive such as the Technics SP10 MKII) instead of a belt-drive, the Koetsu would be found to have excellent bass with sufficient control, the weak bass exposing a belt-drive weakness vis-a-vis 'tables with better speed stability (more torque to overcome stylus drag).

Ballywho,
Thanks for being brave enough to mention your table, because I agree with Twl and Johnnantais.

Putting a $1400 cartridge on a $300 table is putting the cart before the horse. I've tried it. It doesn't work. The cartridge highlights all the weaknesses of the table, whatever they may be. A good table and arm can make even an entry level cartridge sing. That's how Johnnantais is set up and I'll wager his rig would bowl you over. A poor table (or arm) will drag even the best cartridge down.

Sell the Moth/RB300 and buy (just one possibility) a Nottingham Horizon SE/RB250. That'll cost roughly the same as a Koetsu Black. Mount up the Benz and you'll be very happily surprised. You'll also have a rig good enough to support a better cartridge the next time the upgrade bug bites.