We've found that the pilot and copilot altimeters don't agree during accel and decel (ie. during takeoff and initital acceleration up to about 60 kias and decel below 60 kias, although not as bad on decel). Agusta have installed a restrictor on the pilot side pitot system (A109E that is)...god knows why. I suppose that under most circumstances the aircraft is flown single pilot so its not really an issue. For us, operating multi crew, it has given us the shiites but we've learned to live with it.
As far as erratic airspeed (ie. fluctuations in steady state flight) we haven't had any problems.
No blade dramas...knock on wood.
No problems with pitch and ROLL in any normal flight conditions including flight in light to mod turbulence with auto pilot on.
HP