Classic Metal Tone
Little more to say than if you are looking for the sound of Metallica, Zakk Wylde, Jim Root (Slipknot), etc., or looking to upgrade your pickups for rock or metal actives then this is most likely where you will start. I bought this for a Hetfield 'Rusty' tribute that I wanted to do with one of my Gibson Explorers.
Plenty of reviews and sound tests online and on YouTube. People will debate the benefits of active and passive, compression with EMG's. For me, they deliver the tone that I want for certain types of guitars while trying to replicate certain bands/artist tones. You really just have to try them to see if you like them.
One thing that no one else seems to have mentioned is while they are traditionally used in the bridge, I have had also had an 81/81 combination in a Epi LP Midnight Custom and found it to be just fine.
Note that I, in my own personal opinion, have found that the 81 responds better to Gibson/Orville/Epiphone Custom models as opposed to Standard models. Tone is generally 'darker' and helps with the 81 being somewhat brighter or having a greater treble response. Again, my own personal preference, and this can always be adjusted with EQ on the amp, or indeed your tone knob.
There is an excellent video demo from EMG for the installation if you are worried about the wiring diagrams. The quick connect system is very straight forward so do not be too nervous if you have never done this before. I do recommend that you experiment with voltage variations - Google 18V modification.
Price, customer service and shipping from Thomann was excellent as always.