Actually, the Vanity only works in Oppo, thus vanity has decoding +BM, +Trims, + Downmixing, +10db for BD's LFE.
Anyway, this should not concern most, as most HDMI devices seem to have decoding.
Downmixing seems the biggest hurdle if you are 5.1/2.1. Both RC devices have BM & will trim.