I had been using more expensive guitar strings like D'Addario XT, but even expensive strings lost their resonance after 4-5 months, so I decided to try this Aria AGS-800 and I am pleasantly surprised, quality wise I think it is on par with D'Addario XL or Ernie Ball Regular Slinky both on durability and resonance. Granted it is more prone to rust comparing to D'addario XT but it is 1/5th the price. I can replace the strings more frequently, which I preferred over using the same string for like 6 months, which I usually did with a more expensive strings.