The reason you won't find many reviews is that IIRC the Model 386 Sc/S was sold in 2007 only, and was not very popular by most accounts.
It's similar to the later M386 Night Guard, except it has a red ramp front sight, fully adjustable rear sight, and a Hogue grip rather than a tritium front night sight, C&S Extreme Duty rear sight, and a Pachmayr grip. Both guns have a scandium-aluminum alloy frame with a stainless steel cylinder and are finished in matte black.
The main caveat with this gun- as with any small or medium-sized alloy-frame S&W- is that it may not be particularly comfortable to shoot when loaded with full-power Magnums. It should withstand them just fine, but your hand might not.
$600 sounds like a good deal if the gun is in 90%+ condition. If the gun is 98%+ and comes with the box and papers, it's a steal, and you should RUN, not walk, back to that shop.
OTOH if it's less than 90%, I would pass and/or try to talk them down.