I had a CRG Hindsight mirror on a 919 a few years ago (see attached pic). They were fantastic! That convex lense really gives you a great view behind you. Yes, everything is smaller but it's better than looking at your elbows. CRG makes some great stuff and the quality is top notch.
CRG just came out with a new mirror last week called the Arrow:
CRG - Constructors Racing Group
IMO, this is a better looking mirror for sport bikes than the round Hindsight or Lane Splitter. And being able to adjust its position will make the form and function even better.
I'm going to get some block off plates for the stock mirror holes (suggestions appreciated!) and get one of these Arrow mirrors to replace the stock mirror. I think it will make the front end cleaner, and that one mirror will work better than the two stock mirrors.
BTW, I contacted CRG and their suppliers don't have the Arrow yet. You have to buy it from CRG direct for now. And you need to buy the bar-end adapters separately.
Once I get some block off plates and the Arrow mirror with adapter, I will remove the stock mirrors, install the block of plates, install the CRG stuff, and post some pics.