No use at all, returned for a refund

I bought this to ise on my kithchen floor for the grout as it is a light colour and it is starting to look discoloured from where the dogs come in with dirty feet.

I did exactly what it recommended and left it to charge overnight before attempting to use it.  but when i came to use it the brush does not spin fast enough to do anything at all.

I tried al of the brush heads and it did absolutely nothing.  I was pushing that hard I was nearly snapping the stick in half and all it did was stop the brush from turning altogether, but still it did not even scrub anything,  
I tried it for about half an hour but in the end i gave up and did it the old fashioned way on my hands and knees witha  scrubbing brush and was finished in less time than i had faffed around with this so called scrubber.

So basically do not waste your money, it hardly even tickles the surface you are trying to clean. 

The brushes are not man enough to do any real cleaning and the motor has less life in it than a battery toothbrush! 

In tact I wouldl have been able to do my floors quicker with a toothbrush than I did wasting my time with this!