Good deal, good camera, assuming everything is working well and all that. I get a lot of use out of mine. The only real grounds to criticise it, I think, are that (1) the rangefinder base is kind of short, and (2) the materials and workmanship are appropriate for the price point, i.e., a significant cut below a Leica or even the later, more expensive Cosinae. I don't find either of these to be a problem in practice.
About the Jupiter lens, be aware that many people think the Soviet lenses are not quite made to the same focussing standard as the original Leica mount---they seem to work fine at longer distances and/or smaller apertures, but focussing errors may emerge close up or wide open. It's hard to tell just how accurate this is, because there's a lot of sample variation in Soviet lenses anyway...and with all that in mind, you might do better to look at some of the less expensive Western or Japanese lenses for a starter instead.
See
http://www.cameraquest.com/ltmlens.htm for some quick summaries of a wide variety of Leica-mount lenses. Not everybody agrees with everything written there, but IMHO the page does a fair job of acknowledging differences of opinion.
-NT