I voted for 2 speed. This is only good however if reliable (right Tristan?). I believe that our team made the right choice going to 2 speed even with the problems the first year. I will agree that some games might be OK with a single speed. I do like the fact that we can go slow for power pushing or delicate tasks. I know that you can go slow with a 1 speed but there is a larger error margin when in low gear.
The major disadvantage is weight. If you can spare it then it is worth it. As for design and building be a disadvantage that has been overcome by a certain unnamed company.
