The last months I've stumbled over two of these on flea-markets, and bought them. Just got the first rolls back from dev (color, I do not yet do that at home) and I was not that impressed.
I think I am way too used now to having full control and being able to set aperture and knowing where my focus actually is (I mostly do manual focus on my SLR's). Though I can clearly see the quality of the lens, but these two will have to go again, nothing for me, unfortunately, as it's a very neat little pocket camera and the optics is pretty impressive for the size!
I've had one of these cameras from new, use it all the time and have had no problems with it. It has its quirks, flash default is auto so you have to set it to off, and the aperture stays open relative to shutter speed longer than most people would prefer, but it's still a very capable compact camera if you work within its limits. The MjuII is among the cheapest high quality lens compact cameras on the market today, and delivers images that compete with much more expensive cameras.
I shoot slide film exclusively and have always found the exposure on the Stylus to be spot on - even with difficult lighting. As I recall it has a backlight compensation and will lock the exposure when the shutter button is half way down. That gives sufficient control over any exposure situation I've ever had.