Mosess,
Our group bought [6] Sena 20S units [I got out voted] and can honestly say we are all less than thrilled with them. We all came from Collett Communicators which worked awesome in all areas but you had to be connected to a battery pack [makes for great power and range] which a couple of the group didn't like. Hardly any hand touching required. Worked great, awesome distance, not just line of sight as is a RF signal plus with bluetooth for music and such. You and others in group just had to talk into mic and it also had a privacy channel. Been around a long time, originally developed for snowmobiles, waterproof, not affected by temperature. If only they could get a battery that doesn't require being tethered to it.
Having said that I'll get back to Sena's. First we have only did some short local trips as a group but noticed these Issues -not waterproof, distance is poor, line of sight only, if semi cuts in the pack your done hearing from the front bikes till you get back in sight line. Work terrible when running close twisties, mostly useless for quickly emergency warning of group members of things. Lots of interference /popcorn type noise in group riding. Units randomly just quit syncing and unit has to be reset which then leaves you out of the group till the leader shuts group off and restarts it. Usually not till the next rest stop. Only the group leader can turn on and off group ride. Sena voice commands seldom work. If you want to answer phone, voice command or the phone button doesn't work 95% of the time, you have to answer by using/ touching the phone answer button. FM radio will only get the very very close stations. The more units in group the closer the mic has to be and the louder you have to talk and the more choppy your voice sounds. Way more complicated than needs to be and too much hand off the handlebar movements needed. We've been in contact with Company numerous times with a canned answer that they are aware of these + other issues and are working on them and that update 1.7 should address the problems...when, who knows. They just came out with 1.6.1 revision which didnt seem to help any of the above issues.
Now having said all this if you only have 2 units hooked up / paired together they work awesome in all phases of operation, fairly decent with three units then downhill from there. If Sena doesn't fix the issues we will probably be putting them on the garage shelf and looking at something else or go back to Collett.
We are leaving this Sunday 26th on another group ride so we will see how things go as it a 6 day longer trip. :dontknow:safe riding!