Some TR balance points from my perspective:
1) Most balance gear is easy to use, and you just have to follow the directions.
2) Most issues with attempts to balance where the balance never gets close (you chase it all around) are due to bad gear or badly mounted accelerometers. The manufacturer is usually very helpful via phone.
3) Any balancing is better than none.
4) Balancing is probably not especially important for blade components and bearings, but is very important for shaft, gearbox and supporting structures because the imbalance forces are 'felt" especially by them. This means mount bolts, skin near the TR and TGB seals and bearings, lads.
5) Even if the pilot can't feel it, it could be bad for the helo. Some helos have cockpits that are insensitive to TR 1/rev
6) Balance only affects 1/rev vibrations, and does nothing for higher frequencies.