windscreen wiper shudder

[Smeeagain]

Yes I would'nt normally have gotten them to change the blades but I have dropped it in for the 'free' winter check literally an hour or so before setting off on circa 1500 mile round trip over xmas to Scottish highlands - with the way the weather was I opted to play asfe(!) and have them do it. As it happens they were short of time and it was the guy in the shirt and tie who did it so not even a mechanic ....
So while we are on the topic of blade quality selection - what would your recommendation be and why (effectiveness, longevity, price etc) ?