As far as I can tell (and someone correct me if I'm wrong) but the ES08MD do not have bearings, and may have bushings (or nothing but the plastic case?)...
NOT saying they are bad. But I did find these for about the same price I was seeing for the Emax servos.
They are a tad heaver still... but (I hope) are a bit better quality too.
Here is a link to lighter ones;
Unfortunately, I placed my order just about the time the Chinese new year started (apparently the whole country shuts down for a week or two.) So mine haven't even started their 2-4 week journey to my greedy hands...
So, just tossing this out there... Just something else to look at.