Bryton route planning does not navigate a rider down a one way street the wrong way, or around a roundabout the wrong way, yet GC course planning still does; many use other course planning software, free and superior to GC as a result.
It really is about time that Garmin offered Cycle Specific route planning, especially as the 810 promotes the fact that you can sync the planned courses stored on GC via your smart phone, handy as a reassuring back up when on a two week tour and was one of the reasons I personally bought one when they first came out. The trouble is that requires the courses to actually be on GC of course, seeing as everyone I know doesn't use GC course planning, then that is a next to useless feature, that we as the consumer have invested in, only for it to not work anywhere near as well as it should.