I test rode a demo machine from BMW in Northampton and found the gearbox somewhat clunky. I eventually bought an ex-demo machine from the BMW garage in Oxford and found the gearbox even worse. Sometimes it would not change gear when I wanted and it just felt pretty rubbish in general.
I then spent a little time adjusting the position of the gear level. Pretty simple to do. And it seems to have sorted all my problems. I've just got back from a 4 day, 1300 mile trip to the Scottish Highlands and had no missed gears what so ever. It all seems pretty smooth now.
I'm not saying this is a general fix for all gearbox problems, but for those of you who find it 'clunky' like I did may want to investigate this.
The bike I bought must have been one of the first models in the UK as it was registered in April 2013.