The slider may in and of itself certainly be good and cheap - provided you have the incredible luck to get the right sent. The first was indeed labeled "for 25 mm pipe bars" but had only about 20 mm. The replacement came quickly, was again labeled "for 25 mm pipe bars" but had at least 27 mm. My rod tube has 25 mm, so the slider must also have 25 mm and the clamp so that it holds correspondingly less. Is it really quite simple, right?
If you like gambling and love can get along sometimes 2-3 weeks without bracket, for a very strong buy recommendation. All other: Stay away and prefer to invest a little more.