Received mine back today after Ian kindly turned it round very quickly over the Easter break.
The engineering looks to be to a very high standard.
The central shaft comes out, which eases experimentation with oils and is not an issue in use.
Sound wise, things have a fair bit more power and snap, holding together better when the going gets tough.
Definition and clarity has improved too, particularly the low level stuff.
One caveat is that I can only compare at the moment with an old worn mark 2 bearing, whereas the modded one is a low mileage mark 5'er.
This will of course account for some of the difference, but I have to say that from memory, I dont thnk it was as big a difference when I took it out.
For the money I'm happy.
Thanks Ian.