I've owned a few 1258's in 1/10 electrics and they all performed well. Can't run them without a external BEC which turns me off a bit. To me that means I gotta drop another $20 to run it. Don't have to do that with my Hitec, Futaba or airtronics servos. But other than that they've performed flawlessly. And you mentioned "On paper" ..... Big Squid tested and reviewed Savox 750TG ahwile back. Interesting reading.
http://www.bigsquidrc.com/savox-sb-7...-servo-review/