I'm a long time user of EMG pickups as I owned at least 50 old Warwicks and they usually had EMG jazz pickups.
Their new version is solderless, this means you don't need to solder them to the preamp IF the preamp is from the same company and isn't too old.
The sound... well, not easy to describe as of course it's heavily affected by the instrument you put them on. But they're clean sounding, edgy pickups very good for slap, tapping and also pick playing. I would NOT recommend them for fretless, though, where they sound a bit too sterile and you might want AlNiCo5 pickups (smoother, warmer, darker).