I'm using PIAA Si-Tech blades. The standard ones with metal brackets, I gave up on the internal spring ones because the passenger side end of the blade doesn't ever seem to touch the windshield on the 4r or on my Z71.
The PIAAs are great, easily the best wipers I've ever owned (except maybe the factory ones on my Z71). They never squeak or skip and do an tremendous job of clearing off the rain.
I think the silicone coating on the blades causes them to work similar to rain-x. I know the instructions say to do a dry run and let the wipers run a few times without rain every now and then.
The Bosch Icons, Rain-X Lattitudes, and Valeo Ultimate wipers I had before all seemed to quit working in less than 6 months, or after a couple of season changes, usually losing their effectiveness within 4-5. I've had the PIAAs for almost 6 months now so I'll see if they outlast the others. Good thing is I just need a cheap PIAA refill now instead of the whole blade as with the previous 3 brands.