We have traveled about 13,000 miles in the two years our July of 13 M3W has been on the road. It was down for 6 months for a frame replacement (my fault, not Morgan's) and has only really stranded me once when the fuel pump quit. The only other issue was a bad regulator (still made it home) and numerous rubber bobbins. The new frame (March of 15) came with upgraded uprights, the isolation kit for the bevel box (really screws up bevel box oil changes) and the relocated regulator mounts. While the car was apart, I upgraded the compensator, the clutch, the shocks and added an after market cooling kit (love jugs). Probably my next mod will be the Super Max rear sprocket overlay (I'm on my second rear sprocket) and at that point, I would call it done except now I find I should probably do the front cam pulley mod kit.......
My thought is that if you are going to run one of these rigs is that you should either be quite mechanically inclined or have a thick wallet. Actually both conditions would be ideal.
Having said all that, driving an M3W is the most fun you can have with your clothes on!!