I have used re20's on toms...especially the floor tom(s), but prefer them on kicks. I think they get a great kick sound. No over emphasis on the low end. Bleed has never been a problem, and infact I'd almost prefer omni mics on toms and such, rather than crappy cardiod mics with lousy off axis pickup patterns....of course dealing with phase problems. It seems that most people usually cram their mics right up in the kick drum anyway. But really close micing [on the toms] usually seems to combat the bleed problem up there too.....not to mention a well adjusted gate thrown in for good looks too. Nothing like adding up 4 or 5 mics with muddy off axis responses to get a "blanket" thrown over your drum sound.
I have never heard of anyone complaining about leakage problems using the re20. Great voice over mic too... ....you see them in all the radio station [tv] shots with the ubiquitous 309a shockmount.