Tried a set of nickel rounds, 45/60/80/100. On a Czech Spector. Nice and zingy. Really good feel. I may have to boost up the A string to my usual 85 because I’m getting some fret buzz on the open string after I let it ring. Did some relief adjustment and saddle height to compensate. It’s a brass nut and I don’t feel like dealing with that. The others are perfect.