I've had one since July. No problems.
Picture quality is good, if not outstanding but certainly holds its own against other camcorders inthe same price range. The true 16:9 recording is great, especially if you tend to use a large TV, plasma or LCD panel. no stretching of the picture!
Motor noise is quite low but not toally illiminated. Some general motor whir can be picked up from the zoom and mechanism if filming if total silence. However this probably a most unlikely situation for most people.
I thought battery life was OK using the standard supplied batterty and was better than my Panasonic DS28 camcorder. However I have ourchases a 6 hour original brand new Sony info battery from ebay for £16.00 + postage instead of the quoted £100 on the Sony and Jessops web site.
At first I found using the touch screen to control the camera functionality might be cumbersome but in reality have found it much easier than using buttons to and dials to navigate through menus on previous camcorders. It is much quicker if you can live with fingerprints on your LCD screen.
Night vision is not that good and the picture becomes jerky and grainy (partly expected). I prefer to use a Sony light attached to the camcorder accessory shoe and film using normal recording modes.
Digital stills are adequate but not up the quality of a dedicated branded digital camera with 1MP resolution. However its useful functionality if you want a few snaps without taking a digital camera with you.
Was it worth the purchase price of £400, Yes.
There are better, cheaper camcorders available but there are often trade offs i.e. Panasonic have a 3CCD camcorder forthe same price which should give better picture quality. However it is not true 16:9 widescreen and low light performance is poor.
It all depends upon your priority. For a true 16:9 widescreen camcorder the choice is fairly limited to models from Canon and JVC both of whch have they faults. I found the Canon camcorders in the £300-£400 price range picked up lots of mechanical noise even if fairly loud surroundings, same for JVC but not as bad as Canon.
I give the HC42E