I've never tried the Suhr system but I have tried lots of hum-cancelling Strat and Tele pickups. They're great, but they never sound quite as good as true single-coils - even though I do hate the hum and it feels like a relic of the 1950s which we "should" be able to eliminate.

So I think Hunter's right - it's probably almost better not to have the option of switching the noise cancellation on and off, because it
will sound better off! And therefore both settings are somewhat compromised in different ways.... which may or may not get on your nerves. :lol:
On the other hand, I suppose you then have the option of only using the Suhr system when hum is actually causing a problem.
(And I don't think the presence of the switch itself is going to compromise the tone)