It's been really helpful for me when I travel around London on foot and on the train with my bass and has made things a lot easier than if I had my old endpin wheel.
Takes a while to get used to the steering technique and stay in a straight line. Generally, you pivot with your body to control the direction but I tend to use my arm around the bass' neck to pull it and give me more control because sometimes it veers off.
This buggie has plastic wheels and a lot of my friends have the same buggies but with rubber wheels, which I think are quieter and might last longer than plastic.
Also, if your endpin is too small or your case is very thick and covers most of your endpin up the buggie might fall off a lot because it doesn't have much to hold onto. On a few occasions, I have gone over bumps in the pavement and it has fallen off.
This buggie is not perfect and for what it is I think it is quite expensive, however at the moment I think it's the best option us bass player have for travelling.