I use V6 which is basically a Chinese product comes at like 2500 bucks at Karol bagh . Since 2 years now and is working absolutely like a charm. Intercom is a bit sluggish but if you are using just for attending calls and listening to music , it's works great .
Doesn't have probably the best speakers if I get to compare other expensive ones but the battery backup outlives the seven to ten days ride sometimes.