No I don'tThose blades aren't cheap! I didn't pay more than a tenner for my pair posted!
But you've still got to factor in the cost for a new (or used) set of wiper arms

Not many people have a mismatched pair like me, so it's not fair to judge like that.
PLUS:
I've just checked and both types of wiper arm fit on my blades. For those interested I bought them here:
http://cgi.ebay.co.u...e=STRK:MEWNX:IT
I fibbed, they were just over a tenner, still cheaper than those rover ones though and as I say, they work with both arms although they'll need a tiny bit of extra work on the later hook style arms.