| I have used the orbit 90s, and while the rotating design is a good idea, they seemed to be built "flimsy" to me. The luer lock connection wasn't too stout and if I twisted it too hard, it would strip and turn past the stopping point. The connection at the site seemed like it could have been heavier made. I did like that the site would turn in any direction.
However, I got the Orbits off ebay a couple of years ago, and got 65 sets for $75.00!! So I can't complain. I just used them occasionally to make my other orders last longer. Looking back on it, the guy who sold them to me probably stole them from somewhere. Oh well. | 
