I have been using EB strings for quite some time. I've always used the 1148 set on my LP and 1046 set on my Strat. Mostly, I'd go with the regular nickel wound. I've tried a few sets of RPS and Pure Nickel Wound series and I have to say they are all very good strings, but they are not that good for me to stick with them.
I had the idea of trying out these new strings because the other guitar player, who plays an SG, in my band sounds so much brighter and more present than me and we were using the exact same rigs. I knew they claim the Cobalt series would give more output and make the sound brighter so I thought I'd give it a try.
I ordered only one set because this is almost twice the price of the normal EB sets to try it out. The first impression is that the lower 3 strings provides more friction to the left hand than the regular EBs do, which is great for me. This is even better when I got on the stage because my hands sweat. I used to like the sound of a set of new strings but it would take a couple of days for the string to get comfortable to play. The Cobalt provides the great feel straight out of the box.
As far as the tone goes, there's absolutely nothing wrong with it! It does seems to provide a little higher output. The tension seems to be a little greater than that of the regular EBs with the same gauge. But I do find that it's gradually losing its tension after 2-3 weeks of playing (which is quite normal). The string last quite long.
I ordered 5 packs from Sweetwater after I tried the set. Will stick with these for some time!