I had the Cardo 500 and gave it to my girlfriend and decided to upgrade to the Cardo 700LX. I loved the 500: the battery would last forever, the connection time was instant, and the sound quality was great. Before I purchased the 700, I called Scala and they said go with the 700LX for added advantage. I like the 700LX for several reasons, the headset is very light and charges very quickly, it has awesome features and the sound is very clear. The one draw back with the 700LX is the connection time. It takes longer for the headset to answer phone calls. I hear the person answering in the speaker of my Motorola Q and then 10-15 second later I hear the person in the 700LX! Other than it is a very good unit.