We were very disappointed with these chairs - at £25 each we didn't expect the world but they have lasted 6 months only and in hindsight I wouldn't have paid over a tenner for each. 
There are 2 problems which let them down significantly. 
Firstly, the bolts for the chair do not tighten and will keep loosening. We got 2 new chairs delivered but these had the same issue. We don't use the dining table much and so let it slide. Just like these chairs do - side to side because of the loose bolts! 

Secondly - see pictures - in 3 of the 6 chairs. The black plastic 'floor protector' part of the leg breaks very easily. The bare metal left is not only sharp but will scratch a floor especially when people slide chairs back and forth. We are on the lighter side so I wouldn't dare comprehend the consequences if a 6 foot 6 well built rugby player came to visit.
Unfortunately, we will now have to buy another set of chairs for our dining table.