I am thinking of buying one of these in addition to saving cd images to my hdd. If nothing else, it is a convenient way of storing the discs! There are two versions a 300-disc capacity (CX355) and a 400-disc (CX455). I think the 400 disc player will play mp3 and the 300 will not. Are there any other differences? The general Sony brochure does not show the 400 disc and only shows a picture, no description, of the 300. The hifi brochure shows both, briefly, but does not say a lot. I read a review somewhere that you can set them to play random tracks except tracks a, b, c, etc. on the 300 disc one but the 400 does not have the "except..." feature. It seems strange the higher spec machine has less features! Is it missing anything else? Are there any online reviews anywhere else? What features does the 400 have in addition to those on the 300? What is the remote control like? Which should I get? The list you type in of titles, is this stored in a power cut, or do you have to type tham all in again? Are there any players which connect to thye internet to downlaod this information? Thanks.