i have rome 390s mounted right now. took them up the other day for the first time and i thought they were amazing. of course, in my limited experience, the only other binders i've tried were rentals and a pair of size small burton mission bindings (destroyed my feet).
i bought a pair of flux feedbacks as well. i've got those mounted currently in place of the 390s for a test run the next time i go up.
so yeah, no qualms with union, i've never tried them before. they look killer though.
i love my life