I haven't needed to Plek a MusicMan bass yet, but I have had 4-5 other basses done and every one was better afterwards. If you want no fret buzz and relatively low action it's a very worthwhile thing.
It's funny you bring this up because in the next week or so I am sending my Caprice to 13St Guitars to be converted to fretless and to compound the radius. They use a Plek machine...which wasn't a huge selling point for me but honestly it didn't hurt either. ;-)