I've been doing a bit of research but just wanted to confirm with some Hassy users please... assuming you don't care about the viewfinder vingetting, is there any other reason to go for a model with a gliding mirror? I am not fussed with TTL flash metering either. I realise the 501cm's and 503CW's will generally be much newer etc, but a 500cm and a good CLA is still considerably cheaper. Just making sure I am not missing something obvious ;-) My only thought was whether the gliding mirror might be more accurate for focussing perhaps? Out of interest, are there any inherent disadvantages to the gliding mirror? Thanks very much.