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Having had three of these scopes I can say a lot depends on how good your particular scope really is. The best of the ones I had often handled an 8mm - 340X or 1.8 per mm of aperture quite well.
Mental’s M715D can manage 2.5X per mm, as does my MK91.
This is primarily a function of the quality of your objective (ie the scope), not the eyepiece. For example Dawes recommended 80X per inch of aperture / 3X per mm - which indicates that some of the old refractors used 100 or 200 years ago did indeed have exquisite objectives despite the rather modest eyepieces (Huygens or Ramsdens) and lack of modern coatings.
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