Ive been wearing M frames for 25 years. Its time to move on to a new frame. Im tired of scrounging ebay for stuff. The Radar EV caught my eye and looks like the fitment is similar to the tried and true m frame. Can any users who made a switch from the M frame to Radar describe if its similar or what other frames are similar? Does the Radar have different lens shape options like the M frame and such? Just want some input here before I do something. Thanks