I got an Evertune installed on my Explorer and it looks and feels awesome.
The routing really isn’t the issue so much as the fact that the Evertune system is riding on a spring system (albeit a heavy duty one).
The main tone difference from before and after the install was that it was less deep/boomy sounding on the low end. Otherwise I didn’t notice any other tonal difference. There is also less sustain on the higher frets and I’ve noticed that about every Evertune guitar I’ve had.
I also had an LTD EC1000 that came with an Evertune which is the closest to a Les Paul I’ve had, but it lacked the chunk of my Explorer so I sold it.
I may install an Evertune on an LP some day, but it would have be something like an LP Classic that I wouldn’t worry about modifying as much as something with a nice top.