Has everything I need to keep track of my ride, and nothing that I don't. For those familiar with interfaces from other Garmin products will pick it up pretty quickly.
I usually am one to upgrade immediately but the 530 was just too good. However, this is defintely a more responsive unit with additonal features that I didn't think I would use, but have. It's a bit more bulky, but also feels more rugged and I hope to use this until the 550 is out!
I don't like the buttons there's to many and confusing. I've had the unit for two weeks now and I'm still learning how ti use it . its not user friendly. just to turn it off is a pain.
The Edge 540 has numerous new features I did not have with my Edge 520 and the battery life is a big improvement. The unit synched immediately with all my other devices and also merged all my prior settings from the 520. Simple process and robust device