I have rolled the 6.5 and while I find the concept behind the raised sightline interesting, I question whether it is really that groundbreaking. Wouldn't most putters that have a higher sightline than low on the rear flange already be accomplishing the same thing as these putters? For instance, the sightline on my Ping Ketsch is certainly higher as is say the sightline on a Callaway #7 and countless other putters. Not trashing the concept here, I'm just genuinely curious.
This was the video put out by Cleveland that finally made me feel like I got it.