Its a fact: you hardly ever see a bullshark without a Remora and now that I have one, you won't see me without one very often.
I'm very happy with it so far. Worn at four o'clock (sights pointing at beltloop), its comfortable and invisible, even wearing a tee-shirt. A spare tire actually helps conceal (not that I have one (c:). It draws easy and stays in place whether I have a belt on or not. I got the RFT to make re-holstering easier and it does that pretty well without making any sharp corners to dig at you.
Walther PPK/S (Interarms)
The only negative is pretty obvious: you want to be very careful dropping your pants.