I received my new 7" wiper blades today and fitted them straight away in 5 minutes without having to fettle them.
The new wiper blades are about 10mm longer than my standard blades which don't have end caps and I initially thought I would have to trim the end of the drivers side blade to clear the drivers side vertical screen frame. This wouldn't have been a problem, however the blades just fitted.
My first impression was that the new blades fit the wiper arms much better, the standard ones having a lot of slop. In fact the standard blades are very flimsy and poor quality compared to the new ones.
I fully agree with others recommendations even though I hope not to use them much!