$140 is too high for new, let alone used. They retail new for about $120; I wouldn't go above $75 for a used piece.
I kinda like mine, but one has to remember what it is. I removed the mag safety and superglued the slide mounted safety in the "off" position (kept engaging during firing). I have the 5" barrel kit for mine, and hte little bugger is surprisingly accurate. Reliability has been as good as most other .22 auto's I own or have used.
One thing I have noticed is that the hammer beats up the underside of the slide pretty good. Hasn't become an issue yet, but I expect it will.
It's a shame these little critters aren't put together better. They have good ergonomics, and I like the exposed spur hammer. They also have a pretty darn good triggers. I would happily pay upwards of $300 for one with a little better fit and finish, made of 100% stainless steel.