I have a Moscode Super-It, unmodded. One the first tube-SS hybrids, it uses 3 12AX7's and FET's. Variable loading via dipswitches at the rear. It's a MM unit but its best feature is variable gain up to 72dB. I've used it with a MC that output a meager 0.14mv, and it sounded great. Played as loud as I wanted, with no step-up needed. And surprisingly little noise. It's sound is lively and spacious.
I have a RTS 405, a very serious broadcast MM pre with single-ended (RCA) and Balanced outs. I've only used the former. Internal layout is the most beautiful and perfect circuit board I've seen; and the metal case is welded together for rigidity. Sound is identical to a Krell PAM 7 preamp I had, the last preamp Krell made with a phono stage. Like Krell it's awesome in what it does, but like Krell lacks joie de vivre. I sometimes switch to it for a change of pace.
I have a Parasound Z, but only because it was $5 at a GW. It's competent. If it were my only phono preamp, I'd give up Vinyl. I keep it for testing if cartridges work — and to pass on to an enthusiastic newbie just getting into the game, when that person shows up.
I haven't had any of the newer designs. I tried the Bellari, took it back next day. I did have the Lehman, Phonomena (early versions) and a couple others I forget, but none were keepers.
Mostly I use one of three full-function preamps — DB Systems Audio, with perhaps the most accurate phono stage ever (MM only) — Luxman CL-34 all tube (MM only) — Tandberg (MM/MC), which has Mono switch and Rumble filter, both useful features, and 3 settings each for impedance and capacitance. The MM and MC stages are each entirely separate, complete phono preamps, not the usual MM stage with a switch that adds some op-amps or a transformer to boost a MC signal. A very good preamp for all sources, and Phono is spectacular.
When using the MM-only DB or Luxman with a MC, I use either an Audio Interface SUT (Jensen xformers) or a Thorens head-amp — the latter is more dynamic, the former more transparent. I favor the SUT because I love the sound of the Luxman and of the DB, and the SUT adds nothing to that sound, only gain. But I use the Thorens active head-amp when using a passive preamp, because it adds dynamics, which are reduced with the passive.