I got my Stone 3 in the mail today and it is working great!
If you have occasion to take the V3 apart you have to be extremely careful as the wire from the coil to the expansion ring that fits in the bottom cap is rigid and just barely long enough to reach the expansion ring tab when everything is in place.
When I tried to unscrew the top to fill it the coil assembly stuck to the top cap and rotated with it pulling the expansion ring loose. In the process of putting things back together after disassemble and cleaning I discovered the center post was just barely catching the threads of the bottom cap and came loose. When attempting to get it threaded back onto the bottom cap the solder connection on the expansion ring tab broke loose.
Had I realized that the center post should be threaded tight which would prevent it rotating with the top cap I could have been more careful and avoided breaking the solder joint. A longer wire like the ones in the V1/V2 would probably have eliminated the problem.
Just pointing out to V3 users to be very careful with the innards of these units, the solder joint is very fragile when maneuvering the expansion ring.
Errol