I purchased a pair of Radars and just got them out for my first ride/run brick yesterday. I also own a pair of half jackets and two pair of M-frames. I’ve never liked the half jackets. Don’t fit well and suck as a riding glass AFAIC. I’ve always loved my M-frames. Perfect for riding aero and stay on the bridge of the nose like they’re glued on. The only drawback I’ve ever had with them is keeping them clean while riding. I’m a heavy-heavy sweater.
The Radars live up to all of the hype. I was skeptical while purchasing but it was money well spent. The lenses stayed perfectly clean the entire day. It’s pretty amazing. They fit almost exactly like the M-frames as far as comfort and staying put. They’re just a tad different that will take some getting used to. But the most important part is they stay in place like they’re mounted to your nose. I always hate when I lower my head and my glasses lift off my nose. The M-frames nor the Radars do this. The Radar is a great pair of glasses. I absolutely love them. So if you’re out there waffling on them because of the price make the leap because you won’t be disappointed in them.
Edit: Thought I’d add. Initially I was concerned about the width of the frames on the side and the width of the arms. I like the slender features of the M-frames. Thought this would be a problem when I was looking at the Radars on the web. The width of the frames are not even noticeable. Not a factor at all.