I'm having quite a bit of fun with Payson strings on my ABs.
On Phi (Red AB1, passive), I now have his "new" F# setup - F#, B, E, A,D tuning. It is rather amazing. I want to go back and re-write some parts of some songs using it. No rehearsal with my favorite band this week though, so I may just take the couple of hours and write some riffs on it, record them, and post here. As I understand it, the F# is still in development, so there may be some tweaks. But, it works very well with the other set of strings from him. I was a little unsure about it, as I've only lightly dabbled with F# in the past. I've got a bit more dialing-in to do on my rig, but it's turning out so, so great.
On Pi (Blue AB1, 2 band glock, P-tone) I have his standard set and a new string for Drop-A, which my band uses pretty heavily. We switch between B and A, and this string EXCELS at both. I thought "Sure, it might do Drop-A well, but then B will feel tight/odd". It does, but it is not bad at all. It's actually nice, as I was wanting a little more tension at B than the stock Dingwall sets gave me, and this nailed that goal, while also shoring up the Drop-A a bit.
So, yeah. These are some sweet strings. Payson himself is great to talk to. It kind of reminds me of how Kalium was a few years ago before they had massive growth. He's really hands on, cares about his products and every user, and has great advice.
More to come on these strings as I get time. I'm pretty sure as soon as I get my custom AB1 six later this year, his strings will go on it.
Can't be the price too... his 5 set pack is super affordable. My only real question I have right now is longetivity. With the Dingwall strings, I was changing strings once every 2 months or so. As long as they last that long, I'll be happy.