I use one...I was getting crap results (Swirling and stuff), then I realised it is doing all the work for you and you dont have to push down hard inorder for it to work! After that I got excellent and painless results!
OK people question
Do you stay with a very cruisy, good but not great paid job that is not very challenging...or do you take a well paid job, that will likely work you like a dog and challange you