Re: Skipping & Chattering wipers.
Yep - My uncle used to swear by the PIAAs, but the price is horrendous so I've always stuck to Bosch on my 156 and my wife's Yaris.
I always had good results with Bosch - although I got a couple of sets via eBay and they didn't last long before streaking. Maybe they were "seconds" or even fakes...
After Autoexpress voted Champion the best in a group test, I searched high & low to try them. Eventually I got a set from my local Partco motor factors, but again, on my wife's Yaris, they didn't last long before streaking.
I tried Rain-X treatment on my old 156's windscreen just before I sold it, to see if that gave the same result as the PIAA wipers at a cheaper cost, but didn't like the "misting" effect as the wiper crossed the screen.
Then I splashed out the £43 it cost to replace my 156 wipers with PIAA and they were a revelation! Absolutely marvellous. Can't sing enough praise - even at that cost.
The beading effect makes for far better visibility in heavy rain and spray. The curved passenger wiper fits perfectly. You have to remove the anti-judder clip on the driver's side wiper arm, but once the car is moving there is no judder (there is a little when stationary, but to no ill effect...).
I was so impressed that I rushed out to buy another set for my wife's Yaris - and she thinks they're wonderful too!
So yes, I've spent £81 on two sets of wipers. That sounds ridiculous, but even though its my own hard earned money, they were worth every penny.
Can't speak really long term, but when they do need replacing, PIAA sell replacement rubber inserts at a much reduced price...