Fabulously useful especially if adding pipes to racks for extra items, could have done with some rubber inserts though-bought 4-all used- all good. The rubber inserts would have stopped the cymbal booms or tom mounts from receiving gripping "teeth marks" on them and in my opinion would have held them tighter for it.
Also I noticed that when used on chrome pipe it certainly didn't leave a clean surface after it being mounted and even slightly penetrated the Gibraltar pipes, which meant if using again you may reconsider these in light of an attachment that had some rubber grips-alternatively use them they do very well but line them with some cushioning or rubber for mark free pipes or tubing.