I already owned the Harley Benton Brian May Red Special based model BM-75 but always wanted the previous out of print version BM-70 with the pickup on/off switches, too. Finally I got it two years ago via marketplace for 220 €!

Here are my pros and cons for the BM-70:

pro:

• has the pickup on/off switches for any possible combination, which is really cool
• the nut seems to be better quality
• it looks more like the original Red Special

cons:

• it is much heavier, 3.5kg vs. 3.1kg for the BM-75. So it doesn’t feel as comfortable like the BM-75.
• the tremolo backplate is better designed for the BM-75, you have better access to the string slots and spring screws.
• the fretboard has a lighter color and doesn’t look as good as the darker one on the BM-75
• it has no serial number, model name and manufacturer country on the headstock

Conclusion:
I kept both because I like the guitars and its sound. But the BM-75 feels better to play and is more comfortable. The BM-70 has interesting sound options and looks more like the original Red Special.

BM-75 vs. BM-70 (back view)