JTEK Shiftmate question

Has anyone had experiences with JTEK Shiftmate?

Does it shift well with Shimano 10 speed wheel with Campy 10 speed drivetrain long cage with 29 cassette?

Once the shiftmate is installed, does that mean I will not be able to use campy wheel/cassette on the setup? Only shimano?

Or does it work better using .3mm spacers?

Thanks in advanced.