I think most cleaning pros have their own favorite vacuums. Me, I love Shark Rockets, because of the bright headlight. And they have great suction as well. However, they have their drawbacks. The Shark company uses cheap plastic parts made overseas. And if somehing breaks, it is expensive to replace those cheap plastic parts. It makes no sense to me why a good company should do this, but they do.
Orecks are great, too. But an upright cannot get into tight spaces like a wand vacuum can. They are also quite heavy and the bags are not cheap. I cannot explain this, but in some homes, the Oreck works better and in others, the Shark does.
I LOVE having the bright headlight! The first time I used it, in my own home, I was amazed and a bit shocked to see what was on my floors! Now, I absolutely depend on it to help me in my cleaning work in others homes. The head detaches and you can use various tools on it. It is like having a bright flashlight with you, and you can easily clean walls, high places, etc., with it. Recently I cleaned a home for the first time. In their bathroom, I quickly saw that the walls in the bathroom were just covered in dust bunnies! (Due to paper products such as tissues). In this case, I used my Swiffer mop to get it all down quickly. But if I hadnt had that bright light, I never would have seen what was truly there.