The Dublin Bikes are a great addition to the city for both tourists and locals, especially when the sun is shining :) Cheap to hire for short spurts of time and very easy to sign up for and use. My only gripe is when you get to a bike station at your destination and find that there are no spaces left! Surely there must be a better and quicker system to monitor when spaces are filling up or when bike numbers are running low and should be re-filled.