Ah the good old extractor, bought my first one 32 years ago, the last one probably 20 years ago to be honest I built my business using extractors, but then moved on to bigger and better things, the thing is with portable machines it's not what they look like it's what they do, I remember using a single lamb Amtech vacuum motor and the colossal water pressure of seventy pounds per square inch which today would seem a bit pathetic, considering even modern portables can be up in the 400s, but to be honest I haven't looked at extractor products lately today they probably do machines with much higher water pressures and twin or triple vacuum motors, they have obviously been about since the beginning of time so they must be doing something right, without them I would never have got into the business because their prices were very reasonable compared to other manufacturers, hope this helps.