Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disapponiting.

I ordered several of these tubes expecting to not have to change a bike tire for a long time. I was sorely disappointed. I'm not sure why, but I have had several flats on every bike I've put these on. I haven't treated them roughly - I just ride to school and back, about a mile each way. I keep the bikes outside, but I'm not sure what difference that would make. The tubes appear to be particularly vulnerable around the valve, and when something goes wrong smelly green stuff gets oozes out around the valve.In short: try something else! This is a great idea but has been horribly executed by the Slime guys.