I have a Nitty Gritty 2.5, and it does a very good job. As with any vacum record cleaner, it literally pulls the dirt out of the groves. I know of no better way than to vacum a record, VPI or Nitty Gritty both do excellent jobs, and I doubt there is enough difference in them to make an arguement as to which is better. The VPI does have a stiff brush, but you can purchase that seperatly and use it with a NG machine as a hand held brush. I use the small brushes from LAST and clean both sides at the same time, flip the record repeat (you get 2 different directions of cleaning that way per side, helps break up tough stuck on dirt, mold release compound etc), then vacum each side.
I know Mike Fremer (Stereophile) pre cleans with an Orbitrac before vacuming, this is about as obsesive as you can get.
If you are cleaning garage sale albuems, check out some of the power cleaners, I know LAST has one. These help break up really tough stuff before conventional vacuming.