I bought two of these pickups to install in my Ibanez RGA7 - yes, in both the NECK and the BRIDGE position.
There's no tone control installed - only single volume pot.
The reason is that I want a) consistent levels, b) consistent sound that's only altered by the physical position of the pickup, not by it's inherent characteristics determined by wiring.
This allows me to use both pickups for either rhythm or solo work, depending on the mood of the song (although I prefer bridge for rhythm and neck for solos).
In that respect, the 707s perform with honors, sound is heavy but not muddled, bright but not telecasterish.
But, as with any pickup, the overall sound will depend on your guitar - the guy I bought the RGA7 from has 707 installed in a S-series Ibanez and the two guitars sound differently.
Your mileage, and experience, may and WILL vary, but if you're looking for a solid heavy 7-string sound, 707s will not disappoint.