In reply to alexcollins123: The condition is as reported on my blog: there is a roof but it is in no way waterproof. As far as I've been led to believe, Mar Lodge Estate will shortly be carrying out consultation on the future (or not) of the refuge. The MCofS, the SMC and the Cairngorm Club amongst others are in favour of retention and renovatiuon of the refuge, and the MBA is capable and willing to carry out the work and look after future maintenance. It just awaits a final decision.
However for the immediate term, you would not be advised to rely on the Garbh Choire Refuge unless in dry weather. Even then, it's very small and not the most salubrious of shelters.
The Smith-Dey Bivouac is a 'shelter stone-type' bivvy in Garbh Choire Daidh, just below the ridge dividing GC Daidh from Garbh Choire Mhor. It sleeps two but is quite claustrophobic. Some nice campsites just below it though.