Yes Steve it actually came with the window by mistake and I sent it back - if I did get it back though - well you know me it would have fans in it before you could say fans

As for sizes really the HAF X is not really much different looking at the dimensions
(HAF X 230 x 599 x 550 HAF XM 252 x 530 x 579) it is actually a bit deeper but less in height but my main requirement was the width and length and well I just find the adjust-ability of the XM that much nicer

The one thing I did do though was to replace the 200 mm side fan with two 140 mm's as I got more airflow and less noise ( I did try one of those 200 mm Coolermaster Storm Force fans but heck the noise) Plus I put all blue ones in wasn't keen on the reds.:)