On first use the switch operating t

On first use the switch operating the rotating brush heads would not work properly, so it was impossible to turn the brush heads off. This made it unsuitable for use on hard floors, rugs etc.Even when using on a carpet and set to the lowest suction level (this model only has two settings high/low, rather than a variable setting like the previous model), the cleaner is very difficult to push across the carpet. Even if you are strong and fit you could end up with back ache. I certainly don't think it is suitable for elderly and/or less strong people.Due to the fault, I returned to Amazon who, as usual, made the returns process very easy. I opted for a refund rather than an exchange, partly because no quality product should arrive effectively dead in the box and partly because it was so difficult to use.In my opinion Shark need to focus less on bringing down the price if it's going to be at the expense of quality, features and usability.