Putting speakers high and tilting them towards the audience always gives good results, so I decided to give them a try, because they don't cost a lot.
Pros: really cost effective and can help in some situations. Tube diameter of 35mm fits the most stands and speakers.
Cons: as expected for this price range, their functionality is not the best. 15° tilt can be quite a lot in some applications, so you must raise the speakers quite high and for this you need really strong stands. Putting speakers on and off tilts can sometimes be very hard.
Summary: if you have really good results and functionality buy tilts with adjustable tilt, and expanding mandrel system, but those can be quite expensive.