The Radar appears to be the successor to the M Frame, although, thankfully, the M Frame is still being made, so it's more of a weird cousin. That's a good thing though. Well, with Oakley it is...
The Radar is a hinged design frame and is much deeper than an M Frame, but still fits and feels like one despite being a little heavier. The Range lens is similar to the classic Heater M Frame lens, although not quite as deep and with side edges that don't extend quite as far back.
It's a great shape, like a cross between a Heater and a Sweep lens, it also features Oakley's Hydrophobic coating (to repel water), which does seem to work but you do find yourself wiping the lens as much as any other glass, as it's the contaminants that dry on the lens that hinders the view (salt etc).
So it's an innovative feature that, to be fair, has little point. To list all of the names and marketing babble that Oakley have going on, this frame and lens combo would need its own website, and wouldn't tell you anything that cannot be summed up by saying the Radar is a fantastic design, very well made, and the new lenses are excellent - the only trouble is, as with most things Oakley, it costs far too much considering the volume they produce. There is perceived value, and there is too expensive - everyone we asked said it was the latter of those two choices.