I have 4 of the mistaway 700 models in the shop and there GREAT,,, on the VF2ss mills they more than keep up ,, on the bigger VF4ss mill it could have used the 1200 model but the 700 works for all but a face mill going like hell on alum.. I just pull all the filters and line it up with the stock hole in the top and mark the holes with a sharpy ,,, you only need to drill for four 1/4" mounting holes and the stock gasket seals it up good ,,
they say there upper filter cant be washed and must be replaced ,, but I spray it down with de-greaser and wash it with warm water ,, air dry it for a day and put it back in ,, the trick is don`t run it tell its fully gunked up with crap ,, I do them about every 4 to 6 months ,, Well your cleaning the top paper filer also clean all of them,