The Select series are passive, high-impedance pickups. I've used their bass humbuckers and JJ sets, and they're fine. Nothing to write home about, but not bad at all for the money. The EMG HZ series are better:
EMG HZ Pickups
And then of course, the regular EMG pickups are completely different - they're low impedance with weaker magnets and bigger wire, etc. and the magic is in the preamps built in to the pickups themselves. I love regular EMGs but not everybody does.
I'd probably skip the Selects and move up to the HZ series. They're passive, but much higher quality.
Matt Farrow