Like steveproracing and mattr, I have tried many servos and find that I always come back to Futaba. The demands in 12th scale are not about power, but speed, accuracy and life.
I am not alone. There has never been anything to challenge the widespread use of Futaba and Sanwa servos in 12th. Yes, there is the odd Savox around, but if they were that good there would be more than the odd one or two.
When you see posts here asking for help trouble-shooting interference and brown-outs, 90% of them contain the words "...and Savox servo."
Like a lot of things, you get what you pay for. There will be lots of happy Savox customers, and lots of unhappy ones. As opposed to almost totally happy Futaba customers...
Just my thoughts...