It's been more than a month on the XB65 at 27 lbs, and it still feels so much more lively. I am impressed with both the durability and tension retention, still got good repulsion. As we don't get the No 1 and D61 anymore, I got no other choice than the XB65. And for the time I able to churn out of this string, none have come close, so the price is justifiable for me ( I play for around 2 hours per day, for 6 days a week)
