Been playin' 45 years. 59 years old. Just put these on my new SX and they are awesome for most of the stuff I do. Old 1960s RNR & Country. I used these many,many years back when I was a kid on my 64 fender "P". I've got to tell ya though I'm so used to my Carvin BB75 that plays like a guitar with light gauge strings. I use my pinky of course to make the stretch. Well my pinky needs a whole lot of exercise to get used to pushing down on these monsters. I do love the sound though. Now a few pointers if you are anticipating these strings for your SX Ursa 1. 1. The wholes in the bridge for the "E" & "A" string need to be drilled a little larger. 2. The nut for the "E" string needs to be filed a little also or you'll crack the nut.Kinda like I did. Looked OK but not quite I guess. Staying together but Kurt has one on the way for me.