Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Avoid at all costs

I used to be a strong proponent of Roomba products, and I thought the Scooba would work well, too. However, the newer products, both Roomba and Scooba, have very unpredictable battery life. It's not clear whether you should leave the batteries on the charger or unplug them, and it seems like the instructions are the opposite for both the Roomba and Scooba. This confusion caused my batteries to no longer hold a charge after only 10 uses. Customer service, which used to be very user-friendly, refused to replace a battery for free. I've been on a waiting list for a new water tank for almost a year because of difficulty opening it. It's a shame. I always used to recommend Roomba products to all my family and friends, but I can no longer do so with a clear conscience. While I still use my original model Roomba vacuum, I find it much, much easier to wash the floors with a mop than with the Scooba.