Has anyone had trouble with speed on their tt

Correct, Tony.

Except...

System inertia is key here, and certainly not platter flywheel effect like some turntable designers would have you think. I like high mass platters, but where the mass is located is critical, in my opinion. If properly done, the platter can be an extremely important component toward reaching the goal of optimal system inertia. I realize that my view goes against conventional thought on the subject, but I am convinced that the location of platter mass is a big deal.

One day maybe people will see that a platter should be more than a big round chunk of whatever, but right now there seems to be little thought put into platter design. Guys use a lot of different materials in lots of different combinations, but in the end they are still nothing more than big chunks of whatever for the most part. Isolation and tone seem to be the only concerns. That and marketing hype.

Richard, very easy to read with a frequency counter and test record with steady tone. In a fraction of a second I've seen servos change 30 hz when playing a 2150 hertz tone.

Technically whatever it is the proof is in the play back, one outstanding example that will shock anyone that thinks they are familiar with this outstanding RCA Living Stereo recording is Belafonte at Carnegie Hall, Belafonte's vocals are much different, it will stop you in your tracks.
I'm not claiming that I have any answers why this Lp sounds the way it does including others that I thought I knew well, but I think this goes beyond having a table that is capable of precise speed no matter what is going on in the music.

Omsed.
If you are observing dynamic speed changes, greater than 1% in a closed loop system, I would suggest that the TT is poorly designed or malfunctioning.

But thanks to everyone for the thoughts. I had bought Origin Live's best tranny/motor DC200/and motor controller and had problems so I bought a second complete O.L.system and had them both turning a heavy steel Aerex flywheel. The VPI tt was updated to the super platter that is now defunct. It was driven with belts and I tweaked them for just the right tension and everything lubed and leveled and was always unhappy with my speed. My McIntosh 831MVP blu ray player with Upgrade Co mods cannot touch Expressimo's turntable and motor. Plus Mac had trouble with the transports and it took a long time to get mine back after owning it less than a year. Digital does have excellent speed and if you get a good modder like David Schulte to shield it properly you can take the jitter out of the digital system. My vinyl still bests it by a good margin.