the only problem i had with the poly heads is static eletricity it got so bad that we caught a field on fire that was a couple of years ago that was the first time and last time we tried poly i would hope by now that problem has been fixed
We've found that by attaching a length of chain to the rear axle of our machines that was long enough to stay in contact with the ground at all times, we've been able to eliminate problems with static electricity. It keeps the machine grounded, and makes a huge difference in the amount of dust that sticks to the glass.