I have both RE0 and RE-ZERO, and they are pretty good for/with classical and baroque music, but in the end, most of the time I end up using HiSound Wooduo 2. They have very sweet and pleasant treble, not too recessed mids, and absolutely wonderful bass extension - perfectly controlled and very very pleasant. For cello music, can't be beat.
I also have Klipsch X10,S4, Vsonic GR07, Vsonic VCD02, Hifiman RE01 and few other IEMs, where only GR07 gets some playtime with classical music alongside RE0 and Wooduo2.