Hello
Yes, I have done a few. I can honestly tell you its the single most noticeable upgrade you can do on this TT. I highly suggest this, and from there replace the sub-platter. The best place to purchase these upgrades are off of Ebay. Here is a list of the upgrades I would highly suggest. Motor, sub-platter, ruby or ceramic bearing, and some new feet for the plinth. The downside being that you will never get your money back out of this deck after you have spent the $500 in upgrades, but sonically you will be in "bliss". Oh yeah, make sure you have a fresh belt. Currently I have a heavily modded Thorens TD125 a Denon DP-80 and a Denon DP 6700 and the Rega holds its own against theses players.
Regards