I'm not very good in soldering stuff so, when I was going to try an upgrade for the SG type I own I decided to stick on this set.
PROs
1) The sound is really different from the standard humb I previously have. I can say it's more balanced when using both positions. The great different I feel is more on the bridge pickup, a crunchy, powerful long sustained sound, great for riffs with a distortion effect. 2) The neck one has a more similar sound than a standard humb, yet it's very powerful.
3) The solderless cables are superb if you're not used to do this kind of work. They are quite resistant so you can stress them a little bit excluding the risk of breaking them.
CONs
De facto you'll have to study where and how to put the stuff in place. I didn't have a guitar with battery holder. So you need to reserve a space for the 9V battery. You need to place the battery not too far from the jack input, so I suggest to do a little plan measuring each part and where to place it. I had to dig a little hole with a tools file and changing the position of one of the screws of the cover. On the EMG website there's a tutorial video on a Gibs Les Paul and you can find all the specifications you need to evaluate the kit.
The only negative thing I found was this: the battery to jack cable a little too short so I had to do a little woodworking.
By the way, the pickups are a huge step up from the standard ones. I can't compare them to old Gibs humbs or competitors, but for my case they were great.