Karlos,
I agree. I had loads of trouble with gg4 but switched to Pulex soft which I change every day and have no problems at all now.
I can`t believe the fuss about a piece of rubber considering the price ( I`m a hypocrite, I know).
Don`t think about the cost, just think that you have to do an extra window,maybe two, a day to pay for it.
With smoother glide and less detailing (and mopping with gg4) you will be doing more than one or two extra windows.
Gerry.