[Tommy Walker]

Seems like a great bike for less than $1,000. The new Shimano 105 is suppose to be a big improvement over the previous model, which did have shifting problems. Be sure you don't have a 2009 version of the 105 and also follow Opus advice on shifting techniques.

Performance has the 100% Satisfaction guarantee, so I would keep working with them until you are fed up and then return it.