we've done installs with set screws in production factories that have lasted much longer than the 15 years needed for the UPS.
On EMT runs, one of the only benefits to compression is if you need to vacuum a pull line through for wire installation. The suction from the vacuum tends to leak out with set screws.
Outside of that, you'll never notice the difference. (unless you water cool the conductors, then you'll make a mess;-))
