Before buying this, I made sure to check out some demos of the pickups on YouTube, to see what they are supposed to sound like. After being impressed by what I heard, I came straight back onto here and made the order.
I replaced a couple of really cheap pickups from a nicely built 7 string guitar. It's a very simple process, if you know how to solder wires. Seymour Duncan have a video up on YouTube should you need further assistance. But in any case, the pickups come supplied with a manual with diagrams of different pickup setups. Again, you can find these on the Seymour Duncan website, as well as more specific requirements.
Now, I plugged in my guitar and with my usual distortion setup on my Line 6 Spider IV. I instantly noticed that strummed chords were much clearer and there was no feedback or unwanted sounds. However, palm-mutes appeared to have less aggression, in contrast to a different guitar I use that has EMGs. Nonetheless, this was easily solved by just adding a bit more overdrive or slightly increasing the distortion.
The clean sound was perfect and would work very well for chilled sections and even for music outside of metal. The versatility of these pickups, in my opinion, make it a better option for those who want to make the most of their guitar, as they can make effective use of it for more genres, such as metal, rock, jazz, etc.
If you seriously need more aggression in your sound though, I would recommend the Nazgul/Sentient pickups. In any case, I would still go for these due to their flexibility and versatility. However, before you go ahead and make your decision, I would definitely suggest you check the Pegasus/Sentient/Nazgul videos on YouTube.