Just pulled the trigger on of of these. I must be friggin nuts to spend $800 on a GPS, hell, my bike isn't worth that, LOL. I've been using a couple Nuvi 550's for rallying and one of them will not hold maps of the entire country and the other has older maps. I considered the 66x series, but they are no longer supported by Garmin and I heard the new 590 is quite a bit faster not to mention the traffic and weather feature. There are some downfalls to the 590 as well, but for the most part I think it will work well. Anybody else have one of these for the BMW Nav 5? Opinions?