Micro Seiki, or TW AC-1

Not to argue with anyone but I am really curious how relevant is the tapping test as far as airborne vibration is concerned?
Certainly if MS does not transmit any noise through the cartridge when tapping, then it is more immuned toward airborne vibration than turntable that does. However, to be immuned toward airborne vibration, how far do you have to go? Airborne vibration is certainly much much less forceful than tapping directly on the turntable. However, I feel that a turntable that failed tapping test does not neccessarily means that it is susceptible to airborne vibration. To pass tapping test, may just be an overkill in engineering or may be not! I don't really know. What do you all think?

Regarding Timeline, I agree that the step on TW motor control is a bit too big. VPI SDS give a smaller increment in speed adjustment. With TW, it was always either a little too fast or too slow. However, I use my TW without any center weight. I setup the speed with a record on the table and cartridge playing the record and usually just choose the speed that is just a little bit slower than what it should be. I assume that when I take Timeline off, the platter would spin a little faster with less weight. So I imagine that using Timeline, I would never really hit 33.3 or 45 exactly anyhow. On the other hand, once speed is set, I have not really notice significant drift in speed that I can detect with my eyes using Timeline.

Don't get me wrong, while I commented on not being able to get exactly 33 or 45 rpm on my TW according to Timeline, I am very happy with my TW. I compared both my VPI/SDS and TW using Timeline and Kab strobe, seriously you can go up and down a few steps on both turntables and KAB still showed steady 33 or 45 RPM and only Timeline would show differently.
I don't know anything else that is as accurate as Timeline and before its availability a few years ago, likely people have not always been listening at exactly 100% 33 or 45 RPM either.
Personally, I play classical piano for fun pretty much daily. I could hear when the piano is a bit sharp or flat, I could hear A420 ad A440, with a lot of patient and careful listening , A442 and A440 but it is not so obvious and personally does not distract much from my listening pleasure either way.
I have not notice any significant speed variability when listening to piano on my TW on the other hand, I do not consider myself to have super sensitive ears and I am sure other people can be much more sensitive to this issue than I am.
I do enjoy listening to my Micro Seiki although it is only a lowly BL-111 with FR64s and Koetsu cartridge but TW is still the table I listen to most often.
I think in the end, each person will need to really listen and make your own choice.

For what it's worth, Minus K does lift the performance of TW up quite a bit. Quite a step up from Symposium Ultra for sure but also at 3-4x the price.