MCA
I bought an Alpha from Headset Services a year ago and it has been well worth the money. Mine has both a dark and yellow visor, and an ANR kit. The yellow visor is amazing, and the ANR really does work.
After nearly a year, the visor had been repeatedly scratched by the visor cover when using it, and when I asked HSL about replacing it, they said it was a known fault of the visor cover - they replaced it on the spot under full warranty with a real carbon fibre cover - great service. I believe the new helmets don't suffer this problem because Alpha have modified the visor cover slightly.
I was going to buy a Gallet, but somebody I know bought one and hated it, so I went for the Alpha, and love it. However, I'm sure the Gallet is still a good helmet and it's probably personal preference!