Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great lens before its not...

Like many of the reviews note... this is a great lens for the price before it stops working.After 3 strikes I am moving to a different lens. Strike One: Auto focus and manual focus died in a month -- lens was replaced by store. Strike Two: Auto focus and manual focus died after warranty expiration -- Canon repair said I must have bumped it. Don't think I did. Charged $96 for repair. Strike Three -- lens focusing died again 10 months later.I like this lens, have taken good care of it (I guess I should say them), but there is a definite quality/durability issue.