Re: New Stack Plus pickups...which do you like?
I have the Tele Vintage Stack in the bridge of my Nashville Tele, with a Classic Stack Plus Strat in the middle. I'm waiting on a second Classic Stack Plus for the neck (to replace the SM-1 I used to have in there).
I haven't finished dialing the guitar in yet (obviously, since it's missing a pickup), but I'm favorably impressed with the Stacks. Take this for what it's worth, since I'm swapping pickups in and out of the same guitar as opposed to A/Bing two different guitars, but I think I lost a bit of sparkle when I went from an SSL-1 to the STK-S4 in the middle. Hard to tell. Most of that, I brought back with a no-load tone pot.
If I was playing authentic twangy country, I might feel differently, but for my pop/rock on a Tele thang, the stacks are great pickups. Certainly, the complete lack of hum is a huge plus that far outweighs any small loss of tone.