[Pj]

Well...

I've got a couple Ive done it to, and a couple I haven't done it to.

Results?

Not much difference   Ive used both for many many months, and don't really detect a difference in time.

Am I wrong?

Conclusion? 

Leave the channel alone, that is how it's made.

[WavieDavie]

You need to trim your rubber closer to the channel end than the length you had pre-dog ear.

If you've done that already I don't know what to suggest - it works better for me that way.

[Cleaner Windows]

i got on better the old way too...maybe i did it wrong but it seemed to make it a bit temperamental etc :S

[sunshine windows]

Make sure that when you 'Dog ear' your channel, once the rubber is in place it is as close to touching the now curved part of your channel. The bent part of your channel has to be as close to the rubber as possible without actually distorting it, otherwise this could lead to streaky results.

This is what i have found when dog-earing anyway and it seems to work for me.

Lance