On thing that wasn't clear about balance shaft removal was the added noise.

The technical manual calls the balance shafts silent shafts!

The engine screams between 3600-4200 rpm where the major resonances occur.

Around 5500-7000 is another node that is loud.

Added vibration? A little - you will notice if your dash is loose.

Added power? Not sure about that one.

Added security in knowing that your non-existing b-belt will never take out your engine?
Priceless. Well at least $2500 worth

Recommendation?
In a 1G AWD 3700 rpm is around 135-140kph
If you do alot of hiway driving around this speed the resonances are annoying. Not quite honda annoying, but bothersome nonetheless.

1991 AWD - SOLD - 1996 - 2008.
2001 JB E39 M5 - NA torque below 2000rpm is niiice.