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@Shiney - why did you swap out your Scala for the Sena? You reported the Scala was fandoogooly good at one stage.
Cheers, Diesel - who uses iPhone and Sena as Streak suggested - but gets really peed off when I try to voice dial "Bob", and the lady in the phone says "dialling Malcolm Jeffreys" - WTF???!! Not even close lady!

Diesel, I switched to the Sena dut to:
Better speakers

Easier to connect extra external items... Radio etc

Communication with Streak on the ride to the Rally

and
My sister and her boyfriend just got bikes and wanted headsets.
So I wanted them to have something that would enable them to communicate flawlessly with each other and I know the G4 set works very well, so I gave them to her and got myself a new set of headsets, the SMH10

And as a side note, I haven't had any issues with voice dial on either sets

it could because I use a first and last name when telling it who to call.
Cheers
Shiney