Pumps like that sometimes 'suffer' from the problem that they'll get a too good vacuum. Those last drops of low-boiling solvent can really make a mess of your distilation setup.
If you get a really good pump (say, one that can do 0.01 mm Hg), you'll also get the 'problem' that your freebase will come over at ~ 60 degrees C, and ketone coming over at 55 degrees. I.e. lousy separation.