While removing grout in a 3'x5' shower base the blade worked well for about a quarter of the job. After that it was not removing material well and then it broke around the collar where it is attached to the oscillator. I paid 30.00 at Home Depot for this tool and could not even complete a small job with it.
It is very fast at removing thinset and grout as a fine powder. I have a little shopvac that I am running right along with. So far I have done 30 12x12" tiles on all sides and it is going strong. I have the dewalt 20V cordless oscillating saw with the fastcut blade.