The SMH10 has stable Bluetooth performance, decent voice quality and a good feature set at a very reasonable price.
SpecsUpdate
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Pros
Pro Group intercom with good range
SMH10 can be pairid with up to three other Sena units for a group conversation. It advertises a 900m open-terrain range and it automatically re-pairs when in range.
Pro Easy to use controls
The headset has a button on the back for smartphone-related actions and a combined button and dial for actions such as volume and toggling intercom functionality. The controls are big enough that they're easy to use with gloves. Additionally, calls can also be answered with voice commands.
Pro Good audio quality
Speakers are clear and can be turned up loud enough to enable riding with earplugs in. Microphone picks up voice clearly up to about 100km/h where wind noise starts interfering.
Pro Good battery life
Sena advertises 10 day standby time and 12h talk time.