I received the IT set today and have had about 2 hours of playing to get them dialed in.
Guitar: brand new 2008 model American Standard strat (maple neck)
Replacing stock pickups with Irish Tour set, vintage stagger, no base plates.
When I installed the pickups, I took the opportunity to completely shield the routings and pickguard with adhesive copper tape and rearranged the wiring to be star grounded. The guitar was pretty quiet already, but now it is very quiet.
It has taken me most of the two hours playing time to get the pickups set at the correct height for balance across the 3 pickups and for optimum tone - this is always a PITA with strats much more so than any other guitar IME. To cut a long story short, I really wasted about an hour being generally disappointed with the tone (way too bright and harsh sounding) and was beginning to think I'd made the wrong choice of pickup set.
With the pickups set much (much) further away from the strings and only just protruding from the pickguard, I finally realised why I had been getting cr@p tone. Now that the amp was doing the hard work rather than the pickups, the ITs were sounding a lot sweeter and less brittle. I really kicked myself over that one because I've setup countless guitars in my time. Felt a tw@, and not in the good way...
I need to live with these pickups for a few days before I get the full feel of how they interact with my setup, but I'm pleased so far. I had to leave this post and come back to finish it another hour later because I was enjoying the tone so much (just strat -> Germanium Fuzz Face clone -> amp) - yoo byooty - turned into an hour of self-indulgent guitar Barclays. I can see I'm going to like these pickups a lot once I get used to them.