Built in car navigation systems are ok for "Point A to Point C via Point B" type stuff. Over the years including rent cars have tried more than a few. Never tried routing a 150-200 mile long multi road changing twisty route on one, doubt that would be any better than the I-taint. Harry's routes at MITM worked fine. The I-taint read them ok and got us where we needed to be with no problems. The I-taint system yakked more than some about stuff, have had car systems do similar at times when on smaller less used roads. Was pleased with the results getting from here to there on unfamiliar roads, did not get screwed up once - thanks to Harry's dedication and efforts. To me that says: If somebody take's the time and works with the system and explore other map making solutions that work - like Harry did with MYROUTE - clunky junk can be made workable.
Have had 2 Garmins owned and operated. Including the replacement unit troubles I had with 660s, I had actually 6 because Garmin sent me 3 that were junk as replacements for the junk unit I already had until HD agreed to give me a New-in-Box one that worked. And by "worked" I mean the Garmins only froze up about once every month or 2 usually at the very worst possible time, maybe worked ok 80-90 % of the time, and Zumo bitch Jill was a real bitch the other 10-20% of the time. Spending more money for a Garmin does not appeal to me, their "customer service" from my experience was worse than anything I have ever had from HD. Troubles ranged from MP3s that worked fine for months, then - no sound. The dreaded "black screen" of nothingness. The "Frozen Here" screen where nothing worked. Removing the battery & hitting the reset button usually fixed these issues. Ridiculous IMHO.
Infortainment screen GPS is the weak link for the newer bikes. Was not a deal breaker for me, knew that going in. If I had better experience with Garmin, might consider mounting one, is still a long shot consideration but not likely. The radio and the USB MP3s and all the rest work ok on the I-taint and the hand controls work ok after getting used to them. If HD GAS they would fix the online Ride Planner that they make noise about being so great all over the place and actually make it WORKABLE with their GPS I-taint. Since HD so far does not GAS, do not see that happening. Would require a purchase of compatible map making software that communicated multi waypoint maps to their I-taint system. Seems like somebody at HD would have thought that would have been a good idea. Except nobody thought about it or if they did they could not get a budget approved for it.