Is a Linn Sondek LP12/Lingo/Ekos with a Cirkus update, the last turntable I’ll ever buy?

If your happy with it YES!!

Impossible question.  If I wanted to be sarcastic, I might suggest that it is the last turntable you will ever buy, but it might be a prelude to the upgrade-itis that afflicts some Linnies, courtesy of Linn.  Which can be as expensive as buying an entirely new and different turntable. But like someone said, I am not qualified because I never owned a Linn.  The brand does have its dedicated fans.  And it sounds like you really want someone to support a decision you want to make anyway.  So, knock yourself out.

Footfalls are almost always a problem with LP12’s, even on concrete slab, unless you put it on a wall shelf, which would be my suggestion. The Audiotech shelf worked well. I’ve had an LP12 setup in at least a dozen apartments/condos/houses on all kinds of flooring, and on several Linn-approved shelving, and always had footfall issues. The Sound Organization table was the worst. For the doubting thomas’s, I had the LP12 for 22 years, always setup by LP12 guru’s.

lewm,
I don't know about already totally having my mind made up. This was sort of a surprise, having this table come available. I was really in the process of improving my digital side of my system. This is really somewhat of a broadside. At 2400.00, if this is great deal and it will substantially upgrade my analog side... I'm for it. My system consists of
Marantz TT-15 with a Hana SL, Musical Surroundings Nova Phonomena, MicroZOTL mz2, Pass XA-25 and Zu Omen Speakers.

Coach, I could only respond by saying what turntables I own and like.  I have a bias against suspended, belt-driven turntables in general.  So there you go.  Am I "right" to shy away from such constructions?  I can only say my bias is a product of nearly 50 years as a vinylista, but time spent is no guarantee of ultimate wisdom.  And on the other hand, I have heard a few very expensive belt-drives, most notably the Dohmann Helix which costs upwards of $25,000 and has a built-in Minus K suspension, that are truly superb to my ears.  On a lower level of cost, I do like the Kuzma Reference as well.  I personally own a much tweaked Lenco idler-drive and four direct-drive turntables, including a Denon DP80, Kenwood L07D, Technics SP10 Mk3, and a Victor TT101, all in massive plinths sitting on vibration absorbing materials that don't "bounce", all up and running in two completely different audio systems.