I'm heading the same way as Zaned on this one.
I've been using ITs for a couple of years now, it was the first set I bought, and I love them. I bought them because of the Rory Gallagher reference in the name - it's actually what led me to BKPs across the internet :D
BUT! While researching another set of strat pickups, I came across a post from Tim describing how RG and SRV got their tones out of lower power pickups but with a) heavier strings than "usual" (I think that applies more to SRV than RG), and b) a very heavy/hard attack from both left and right hand. He designed the ITs to give a fattened vintage set that would get most people closer to the tones without having to change strings/style.
Now, what I realised is this - I've spent nearly 30 years trying to play like Rory Gallagher, I use 11s (heavier than Rory did), and I have a heavy left/right hand.
I love the ITs, but in my hands they sound "thicker" than I would have thought for Rory or SRV. Sometimes I've even struggled to get enough top end out of them. I've just moved them recently into a very bright sounding Alder/Rosewood-board strat (Roadworn 60s), and they are getting much more into the ballpark. But they still wouldn't get me the SRV tone that appears on studio albums - they're just too thick with not enough shimmering top end. But that's with me playing them - if I try a lighter touch, it is all there, but try playing SRV style with a lighter touch!!
Based on this experience, if I was to lose all my current kit, the first thing I'd get would be a warm and resonant sounding alder/rosewood strat and put either Mothers Milks or the unadvertised 62 set in.
I'm guessing, if you're using 12s, that you probably dig in quite hard as well, trying to get that "hot-strat" tone out of your amps. You might not actually need the extra push that ITs provide.
So, if your guitar is quite bright/hard sounding like my Roadworn is - yep, ITs sound really good. They give me a very good Rory and a very reasonable SRV, and a whole load of other favourite strat sounds.
If it's a warmer sounding guitar, like the strat I originally had them in, the ITs might prove thicker than you're hoping for. Still very tasty, but if Rory/SRV is where you heart lies (like me), and you're already halfway towards whacking the guitar like they did, then a slightly lighter set might be better - MMs, the 62s, or maybe even Apaches (I think I've read somewhere that the pickups SRV used would have been much more akin to Apaches in the BKP range).
Hope that helps :D
(btw, I'm waiting for this Monday, when I put Sultans into that warmer strat - assuming all goes well, and I find time, I shall be posting some sort of review of them after that).