The Zumo has a much better antenna than the Tom Tom, other than that, they are pretty much the same.
What that means to you as a consumer is, you will not be loosing your signal as often. To me this is very important.
I can take my Zumo off the bike, and take it inside a restaurant with me to plan/map any changes I might want to make in my route, also you don't lose your signal if you put it in your pocket at a gas stop/potty break.
Others that I ride with have used BlueTooth with there MP3/cell phone/radar detector/GPS, and said it worked fine both with, and with out a helmet, but I don't have any personal experience.
I have a Zumo 450, and it's not Bluetooth compatible like the Zumo 550 is, so I just use a set of high quality ear buds. The ear buds work great, both with, and with out a helmet.
Read some of the previous posts in this section for other ideas.
__________________ Ever notice that the person telling you to calm down, is the same one that got you worked up in the first place.
2008 1250 Bandit ABS
2008 DR 650
2006 HD Road King
2005 DL1000 V Strom (sold)
2004 Twin Peaks 700
2003 KTM 525 EX/C (for sale)
2005 Santa Cruz Heckler  |