In reply to Lynsety:
Haven't been up that way for around a couple of weeks so can't comment on current conditions. The SAIS blogs
http://scairngormsblog.sais.gov.uk/ will give you a feel for the current conditions in the area. Webcam at Glen Shee ski area can also give you a feel for conditions but doesn't seem to be working at the moment.
I normally take the bike at least as far as Glas Allt Shiel but sometimes go right to the end of the loch. Well worth using a bike.
I once saw a couple of guys on mountain bikes on the far side of Broad Cairn heading for Cairn Bannoch - beyond my comfort zone and abilities. One looked as if he was up for it the other seemed to realise he'd made a mistake. They may have come up from Bachnagairn.
I may be up Carn of Claise on Thursday and if you want an update on conditions just say.