Jim McWilliam is the guy to speak to - it's his airfield
Grampian Airways Flying club has the number, or PM me.
I did some circuits up at Longside just over a month ago. One of the runways is usable to about 2/3rds length (28/10), the other two have containers parked on them. There's a relatively decent stretch of tarmac in ok nick, and then there's a less well maintained area further down the runway at the westerly end which is not fantastic but usable for taxying. There's a wire fence at the westerly end so you need to get up by then!
Not sure how much stuff is going on out of there at the moment, the new PA28 for Grampian was up there for a couple of weeks getting checked out - did'nt see any other aircraft around or in the hangar when I was up last aside from that one.
Cheers,
S.