I've just tested the new track grouping feature. It is potentially a great addition - especially for classical music such as symphonies and concertos with separate movements. Alas, the man-hours involved in going back and applying the feature retrospectively would be a serious deterrent.

The niggle pointed out by Joebugs that "the end track in the album view does not look good and needs to be shifted in line with the other tracks" is quite a big drawback as it stands.
I assume can be ironed out eventually.