Hi Bill
I've had CTS surgery, but not the endoscopic type. Mine was the open version but the scars, which are around 35mm long & practically invisible, made my life line longer
From reading other message boards, It seems the endoscopic surgery healing time is faster, however, lots of people say the results aren't as good. That seems mainly due to the fact that the surgeon isn't looking directly into your hand but at a screen. I guess there's lots more pros & cons but given the choice again I'd go for the open version.
Your CTS sounds quite severe so hopefully surgery will make a huge difference after all that pain you've had for years. I only suffered one year of it before having the surgery & I don't regret having it done at all. 8 years on & my hands work ok. I've now got Cubital Tunnel Syndrome though
Hope all goes well for you.
Lidia