I have an old Prince hydraulic stringer that is still going strong after 20+ years. My son was using lux and wilson nxt. The problem is that he was going through the nxt incredibly fast. We found that natural gut (Babolat Tonic) and lux was a better combination. The string last much longer. I think our actual stringing costs with this combination to be less than with the nxt and lux.
Wilson 6.1 95