Superlizard said:
Many pickup manufacturers designed hum-less single coil pickups to satisfy the 60hz hum complaints
of single coil pup users... they offered these players single coil tone without the hum (I still say
they don't have the tone quite right yet).
Again, it's about the tone, not the construction.
They absolutely HAVE gotten the tone right. It's finally been figured out. The old "HS" series Dimarzios, for example, did not have true single-coil tone. They of course had a similar single-coil attack, but were severely lacking in high-end, as well as in dynamics when compared to a true single-coil. Those days are now OVER.
As far as a stacked humbucker being the same as a "humbucker"; not so. I was very young when I got my DImarzio HS-3 pickups for the neck and bridge positions, and an HS-2 for the middle. I saw the Dimarzio ad with Yngwie endorsing them. I mistakenly believed that I could get all the benefits of a "humbucker" with the appearance of a stock single-coil. That, combined with not having to cut up my guitar to install them, I thought was an awesome concept.
I was disappointed to discover that not only were they weak in output and did NOT sound like "humbuckers", they didn't even sound like "good" single-coils. For years, I TRIED to be satisfied with those pickups (because I paid a lot of money for them), but in the end, they had to go.
If your style and set-up is like Yngwie's (playing 75% lead cranked up to 10 with a preamp pedal in front of the amp), then they will work, but for most other typical scenarios, they are not so great.
My Area '67s are wonderful. They have all the woody, sparkling single-coil tone, with plenty of "quack" in the 2 & 4 positions, and NO hum.
I can understand wanting to keep a vintage, collectible Strat or Tele completely original by keeping the stock noisy single-coils in it, but for anything else, it is absolutely ridiculous to have pickups that buzz & hum. Noise DOES NOT improve your tone.