My husband and I had the smh10 units for about a year before the 20s came out. We're now on our THIRD SET of 20s intercom units. The brackets that snap the intercom on are VERY cheaply made. After connecting and disconnecting the intercom from it's bracket 15 times, something in the brackets break, and it will not lock anymore. This renders your intercom unusable. ALSO, there's a battery problem with *LOTS* of the units that render them useless in temps less than 40F. The units will just stop working. Battery freezes (I assume). What we've resorted to: we just never remove the senas from their brackets. This means if we park the bikes somewhere, and leave the helmets outside, anyone could come take the intercom. But they have a finite number of connections/disconnections before they fail. I've not seen them do anything to change the way the bracket mounts.
The extra connections that the 20s does are NICE, however if you want something reliable you don't have to ship back every few months, stick with the smh10.
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