My kit consist of Sena headset and Garmin 660
Sena probably the best purchase I've made in while
It's about 3 years old ,never given me any problems
I swap between two lids ,so purchased a second mount and just swap the unit between them.
You update the software via your PC ,which was one of the main reasons for buying the Senna ,the other was the jog wheel it's so intuitive to use and no fumbling trying to find buttons.
The Garmin ,can never describe these as good value for money
But when the old oracle site was in its prime most people had them ,and ride outs were posted in this format ,which was a great idea down load route turn up ride yer own pace without feeling pressured you had to keep up,but I digress,not had or used the 660 enough to recommend . Oh I still have the 550 kicking around somewhere