That's why I'm asking. That is, to see if we've any history that would indicate good or bad quality
I've spoken to Febest. Naturally they claim to be as good or better than OEM made to extract fitment specs, 75% rubber 25% synthetic for strength and durability. I called and spoke with a few of the reps. They all beat the drum "we're a German Company and build the highest quality standards" When I asked "so are the parts manufacturer in Germany or China"? CHINA! Not surprised, but still that doesn't make them bad.
As stated in OP, the main reason I'd like to give a try, is to match OEM rubber. Mr.T designed with rubber for reasons. I imagine, feel is one reason. Feel transmet to drives hands via the steering wheel. Rubber also absorbs road shock. It reduce shock to front end components ( rack & pinion. TRE, ball joint and control arms). It's also the only bushing we can buy that are designed like OEM.
Poly bushing has been only option I've used in the pasted. They are nothing like OEM. They lack the steal sleeve and center oblong bushing. They are just shaped poly,. Poly's stiffness is felt by. It also reveals marginal components. Addition it may reduce lift of components. The one benefit to poly, they as so easy to install. Just pop in and bolt down. No need to press in like OEM.
I've purchased poly form Whiteline (online). I've also purchased from Slee. Slee doesn't use poly, for what they said to me. Slee just puts in a new rack. Which os best. But I've no intention of replacing/tossing a perfectly good rack
The situation I have currently is I've not driven the rig to get the feel. Doing static inspections, they look good and only ~10 yr 127K on it, from mild no salt environment. I'm being proactive to get the new car feel for next 10 years. But experience tell me within 3 to 5 years steering will be noticable sloppy.
For the diff I'm ordering both OEM & Febest for the from bushing to compare. But I will be installing OEM. I'm may install the side and rear, it depend what I see and learn before install.
As far as difficult. Well, I'm pulling rack & diff, doing both on bench. Easier and less chance of damage that way.
I did see one thing in rubber, it opens up a bit while turning steering wheel back and forth while stationary. Now this doesn't mean bad or that driving will be sloppy (wondering on HWY or lag in turn return). In-fact there is nothing in the FSM to call this out of spec.