I just put a set of these into my Warmoth and had a chance to try them for the first time this past weekend. I'm running them passive, V-V-T with a .047 cap.
They do have a nice high end, but my preference is with the highs rolled off about 30%. I don't care for a hi-fi sound - I like more of a vintage vibe.
These pickups are pretty hot - lots of output. I liked the neck at about 85% and the bridge at about 70%. It gave me a very solid, muscular bottom with excellent definition. Being the bridge pickup is hum canceling you can dial in any ratio of pickups without any concern for noise.
The bridge pickup is very evenly matched tonewise to the neck. Its tone is not as thin as a regular single coil and dialing it in doesn't provide treble so much as an upper mid grit. The tone control gives whatever zing you want to add. Overall I don't find them quite as bright - but the upper mid presence is excellent.
I used this bass with a Thunderfunk 550B/Baer ML112 and a GK800RB/Aguilar GS212 with the tweeter rolled back. Both gave me excellent focused low end with a nice punch that cut the mix easily. I used very little EQ in both cases and got exactly what I was looking for.
I am very happy with this set so far and feel they fully meet my expectations, producing the tones I want easily.