Reindexed my gears earlier before work, shifting perfect on the strand. On the way to work, shifting was sluggish. Well annoying
I'm guessing that it's because most people buy the T3 because it's just that, cheap. It's for people who are just starting road cycling and they aren't going to want to spend £600 on their first bike.
Unfortunately, the tubes fitted are not of the highest quality. May pay to fit better quality tubes.
Rim tape is a good way to help prevent punctures and can be bought from most LBS's