It's my first high-quality digital servos. The stock ones that came with my Losi Ten T were digital but not exactly high quality (the steering had the most torque, at 70 oz-in ). They made some occasional buzzing too, though definitely not as noticeable as my Hitecs. Having said that, they don't sound like they're straining at all, they function just fine, and I haven't actually run my rc yet to see if they settle out after a few minutes of use. By the sounds of things, I guess I shouldn't be worried. I just wanted to make sure there wasn't a radio setting I was missing.