Thanks for all the replies. I have read through a few other posts as well re the "A" and the "A2" and as I do quite a few short trips and round town driving think that the "A2" is definitely the best option for me. After all I bet if you floor it they both open to full throttle in the same speed and that most of the difference is in the 1st half of the throttle movement.

I will print of the instructions from ShawnQ as they look really simple, so thanks for help and I will post what the "A2" is like as soon as possible over the next week (all going well).