It's a year since I've been to the strip (surface transport!) and NS's description is accurate. I paced it from the rut at the Eastern end, to the house and trees at the Western end at 357 steps (say metres). Given the house and trees I'd say that's TODA rather than TORA. Taking off to the East I wouldn't like to hit the aforementioned rut - it's broad and rough.
I thought the surface was pretty good for April - firm (sand/soil/grass) and broad, and largely free of rabbit holes. Having said that, I don't think I'd venture in there in a nosewheel aeroplane. I'm sort of tempted now I've access to a Chipmunk, but I'd class the strip as a challenge and intolerant of poor technique on the part of the pilot.
Fly to Islay, get the bus to Port Askaig and the ferry to Feolin on Jura. Then get a lift to Craighouse and walk half an hour to the strip and check it out. If you're happy, go back to Islay and get your aeroplane!