My background:
Prefer high efficiency speakers (seem to provide better dynamics).
Prefer single driver speakers (more coherent, direct connection to the amp).
Don't like whizzers (more on a theoretical basis than from what I've heard).
Heard the Abby's, TS-1, and Super 3 at the 2003 Midwest Audio Fest:
The Abbys were set up in a 2,500 cu. ft. room with residental sort of furnishings and sounded very nice.
The Omegas were in a 5,000 cu. ft., plain conference room and still sounded good although the Super 3 ran out of umph, especially in regard to bass output.
The TS-1 was warmer, but lacked the level of detail found in the Super 3.
The amount of bass output (within restricted volume levels in that big room) from the 4.5 inch diameter driver of the Super 3s was amazing.
The Super 3 preferred tube to solid state amplification (don't know about digital). I suspect that this is the case with all Fostex drivers.
Omega speakers require stands, but probably have higher WAF.
Workmanship of the Omega cabinets is beyond reproach, but Cain & Cain takes it to the next level. Louis (Omega) has more options for finishes and is flexible to build pretty much anything you want.
IMO:
Any of these speakers would require a sub for symphonic sessions. Told Louis at MAF that the Super 3 with a sub would be ideal for me.
The Super 3 BPC is probably the best Omega yet with it's extra bass and flexibility.
