I just got my zumo 550 and installed it on my bike. I really like it. I got a 1 gb card and have only 127 songs on it and not even half full. You have to get the cord that comes with your bike a and in the left pocket in a longer length. I called Electrical Connection and ordered one. You have to hard wire the gps in and then plug in the cord and you have sound through your speakers on Aux. The Gps will give you turn by turn directions along with your mp3 music. Easy to lean how to program this gps. I am sold. I went on the internet and looked up the 550. Gave me a lot of stores that sell it and how much. I found one for $688 from Comp-U-Plus (compuplus.com). good luck.