I decided to take part in the national fitting day on Saturday, just to see what the 917 would have over my 915.
With the same shaft as my current driver I gained about 12-15 yards which was a welcome surprise. The main difference being I went for a D2 rather than the D3 I currently use.
There was also some sort of promotion if you posted pictures to any of the social media channels on Saturday but I wasn't able to until today. Posted on Twitter and now here.