I cannot rate them highly enough. And if you are ever lucky enough to go their shop in Pimlico then you'll be like a kid in a sweetie shop. Gray Levett occasionally goes over to Japan and brings back a load of 2nd hand kit so I always look there first for anything I am looking for. Don't expect bargain basement prices, you pay for the service and backup provided however that said they do not charge any more than market value, it's maybe just as cheap as dealing with an EBay importer or similar.
Well I have got to visit this place in Pimlico at some stage in the future, particularly since two fellow Scots are giving it the thumbs up.