Very well made, much better that the osmo one which has a plastic attachment (which can unattach and break) whereas this treatex one attachment is made of metal and screwed on. The metal attachment also unscrews off so it can be used like a wall paper brush. Although a bit expensive at £25 it's well worth it as it saves loads of time being able to stand up and apply the floor oil instead of having to use a paint brush on your knees. So it only took 15 minutes to apply a coat to a 4m x 5m floor.
I have the same brush only branded with the OSMO brand. I have been using it for almost 10 years (not really heavy use) and it is still going. Now I purchased this one and it comes from a different brand, but it seems like it is made by the same manufacturer that makes the OSMO brushes. This is why I think this is a great product and would recommend it.