CA_in_NC, I've found my Polar to be pretty accurate. Start and stop altitude may be different but that is a factor of barometic altimeters which, from what I've read, are always more accurate than waypoint-based measurements (that's why Topozone, routeslip, etc., are always off).

Have you called Polar? Mine is very consistent with reading I get from a Ciclosport. However, maillotpois has commented that her Ciclo is always low. I have the luxury of two barometric altimeter readiings from the Polar and Ciclo so I get a better idea of real altitude gain/loss.

Roguedog, V's GPS is just that, a GPS, not a cycle computer. I'm with you on the lack of route info. Their advertisements are confusing because they state that "you always know where you are." But Thom and V told me yesterday that they don't think the 305 has traditional GPS functions the way we all think of GPS functioning.