I used to use Toalson. I used to love the BL8000s for its durability. However, the NP-66 that I bought did not perform well. I found they were extremely durable, and it didnt feel like 0.66mm strings. Also, the stretch on the NP-66 was alot. Even prestretching it, it lost its tension extremely fast. On the pack of NP66, I also looked at the inscription, and it had the words BL6500 on there... So is it the same string??
The BL8000s had great power for the thickness of the string. Durability was also amazing. The only time I ever snapped a pair was when I mishit the top, strung at around 30 pounds.