Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Temperamental and Disappointing :(

Was so excited by the testimonials and had been trying for 7 months when I first started the OvWatch - been using it for over 6 months now - no baby! On top of that, the last 3 cycles it has been malfunctioning and saying 'not reading' and the screen is going dim. Will just have to start using another method and go see a fertility specialist. And OvWatch's guarantee sucks - only 30 days!!!I wouldn't rely solely on this method - use ov strips and/or BBT along with it to be sure.It's also bulky and uncomfortable, and very expensive to maintain (especially when you get nothing in return!!!!!!)