After a jillion rave reviews*, I finally put an Alumitone pickup on my Carter pedal steel guitar. It does exactly what you want a pedal steel guitar pickup to do: cleanly transmit mids, lows and highs all across the frequency range. Pickups actually only do a few things, you know - they transmit proportionately-different levels of different frequencies, they are more or less powerful, they pull on strings or they don't, they're microphonic or they're not... Anytime anybody does any realistic blindfold A/B testing, the self-proclaimed "tone experts" always, invariably, dismally fail in a pathetic way to identify just about anything at all, accurately.
Having said that, there are three kinds of (functioning) pickups in the world: the traditional humbucking ones that are all midrange, like the old Gibsons, and the newer reproductions usually called PAF-something-or-another. Or "woman-tones", or "fillmores", blah blah. Then there are the overwound, higher-powered variants of these which can drive an amplifier harder, and are even more middy. The second kind of traditional pickups are the single-coils, which transmit more highs and are less powerful, and the overwound variants of these.
If you want to sound like rock guitar from the last fifty years, it's simplest to do it with some version of either of these.
The third kind of pickup - the Lawrences, the Laces, the EMG's, the Alumitones - are flatter hi-fi pickups that seeks to more accurately transmit the widest possible range of the string vibrations, i.e. they have more highs and lows, as well as midrange. You can trick these into sounding like "classic" rock pickups, but you have to know how. I personally like this style of pickup, but they're not as simple to EQ as a "classic" design.
I wouldn't put an Alumitone in the bridge of a guitar that I wanted to plug straight into an amp to play grunt 'n' squeal rock 'n' roll with; I would put them into any guitar that I was planning on using for jazz, or through some serious tone-processing equipment. Les Paul himself was aghast that because of historical accident, the low-fidelity, high-impedance model pickups became so popular, when the low-impedance active pickups were so clearly a "better" design, from an engineering standpoint. But the whole rest of the signal chain is designed to sound "best" with the primitive pickups, so unless you want to actually work on tone you're kinda stuck with the caveman version.
*(On the STEEL guitar forum....)