I have a Stanley surform. I hate that thing. I wouldn't give it to a prospective bowyer I cared at all about
Eric, I use the #49 at least three times as much as the #50, but love the 50 for what it does. It doesn't happen often, but I broke out a new #50 last weekend. My old one was wayyyy past its prime. In 15 seconds, that new one reminded me why it holds steadfast in my lineup of top shelf tools. I was one happy bowyer, let me tell ya.
I 'progress' through tools as I work on a bow. Experience tells us which and when to graduate to as work is accomplished. I do it almost subconsciously... see or feel a need, reach, employ the tool that brings the desired result. The #49, #50, Farrier's, and Cabinet scrapers are ALWAYS within arm's reach of the bench vice or bow horse.
Honestly, if I had to, I could probably get by without the #50, but as I'm using it, I always think... "Yeah... THAT'S what I'm talkin' about". "That's the $#!^ right there!"
I'll be using both the #49 and #50, as well as my freshly sharpened cabinet scraper, throughout the week as I reduce draw weight and tiller the osage selfbow I'm now working on. Just saying so makes me happier than it probably should