I have been using them for a few weeks and find them quite good. I have used the prespray extraction detergent and the rinse so far I like the fact they all encapsulate as well. I haven't used them enough to decide if they are the way to go but its looking good so far.
As far as power goes they will be as powerful as a product with the same ph. It really depends on the task at hand as to what product power or ph level you choose.