This Vitaphone sound short has been recently restored. On other Vitaphone film of the Revelers has not yet been restored--and hopefully it will be in the future.
The film consists of the quintet dressed in tuxes sitting around a piano and singing three songs--a large number for this sort of short. They sing their hits "Mine", "Dinah" and "No Foolin'". As far as the style goes, it was very popular in the 20s and 30s and the group had been around for almost a decade before this film was made. However, it's very dated today--even for one of these Vitaphone experimental films. Their harmony is quite nice and I enjoyed the last two songs the most, but it's a hard sell to most audiences to see and actually like this sort of thing today.
UPDATE: When I watched this again tonight, I found I enjoyed the Revelers much more. Their harmonies were lovely and I found myself bopping along to their music! Because of this, my score is a bit higher this time.