Was browsing around at different options for monitor stands and happened to stumble across this one and decided to take a punt on it, given the price.
Well I wasn't at all disappointed. It arrived promptly, the instructions were reasonably straight-forward and the quality of the actual product is particularly impressive (albeit unexpected). All of the parts I used (I opted for the C-clamp) were solid and well-built. My monitors already had screws in them for the VESA bracket so I used those.
The stand easily holds my 23 inch screens (weighing around 4 - 5 kilograms each) with no signs of sagging after a few weeks of use. Having said that, I have set mine up in such a way where I don't move them around at all, so can't speak to whether they hold up if being frequently moved around.
One thing that I did note was that if you want your screens to sit close together, you will need to have some space behind your desk for the arms to fold up. My desk is flush against the wall and as a result the arms need to be straighter, resulting in the monitors having a gap in between them (which luckily suits my purposes). Other than that, would definitely recommend.