I would argue that the solid aluminum case brushless servos from JX for $45 shipped are indeed comparable in performance with high end servos on the market:
https://www.youtube.com/watch?v=Ncg8qhtPSVs

I've been racing these JX servos in both my 1/8 buggy and truggy for the past 14+ months and overall I have been pleased with their performance, a recent race day proved the servo was quite capable with a 98.7% consistency (my personal best) for someone recently bumping up into Expert from Sportsman:
Thornhill Racing Circuit :: Thornhill Championship Series #1 :: Expert Electric Buggy (Heat 1/1) :: LiveRC

I do need to point out that my truggy servo did strip after the first 10 months of racing and the replacement gear has held up fine for the past 4 months of racing. I've also started to notice a pinch of slop starting to form on the buggy servo after 14 months... still having great results even with the slop, but planning to replace the gears as a preventative soon.

Although JX doesn't sell gear replacement sets (most name brands charge $25+ for a set) I've found that I can get get a donor servo for under $10 and simply swap out the metal gears from the cheap servo making this a win-win for me