Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disposable foil shave

I have used many electric shavers over the years of both foil and rotary design. The Remington CleanXchange does the best job of any I've used. The foil cartridges are disposable, the last 6-8 weeks and signal when they need to be replaced. There is no cleaning or other maintenance required. It appears that Remington is fazing the shaver out. The cartridges are becoming hard to find, but I'm thankful that Amazon.com still makes them available.