Loved the EX-G when it was my main trackball! Unfortunately the switches started double-clicking after a year of heavy use, and by then models with more ergonomic angles came out so I replaced it instead of repairing the switches.
Currently on a Protoarc EM01NL and liking the aggressive angle, but I do miss that the Elecom balls are easier to remove in order to clean the rollers.
You're describing swap.