When my car was in for servicing last week, I had them finally switch out the original blades on my car (the OE flex ones from Audi). They had only just started to streak a little bit, which, after 18 months I thought was pretty good.
My wife put a set on her Civic about a month ago and work a hell of a lot better than the regular, traditional-style Canadian Tire "all season" wipers she had before.
I say go for 'em.