digital eq/room correction trade-offs

"I'm not convinced that I wouldn't just be winging it with these new systems. Not to mention the problems introduced with additional jitter as the signal gets switched back and forth from digital to analog to digital to analog."
I wish I could say that the automatic equalization (Tact) was the end of it, but it is rather the beginning of several rounds of trial and error, probably over several months. However, what's new! It's a hobby after all, and we are in it because we can hear and appreciate changes that others ignore. The good news is that one can hear the improvements (and errors) immediately and at no additional cost.
As to the jitter. No additional jitter is added in the digital realm. I do have the balanced digital signal running to an internal DA in the Tact, but I had a Wadia DA originally and both work well.
Finally, the analog source AD/DA conversions. I use a SOTA table with a Souther arm, an AT magnetic cart and a CJ EF1 preamp. I run the TT to the CJ and the to the Tact. I had a Quicksilver tube full function preamp with Mullards etc. and compared the pure analog with the AD/DA. To my ear the gains of the Tact system far outweighed the "loss" of the AD/DA conversion.
My experience and evaluation is much like Richard's.

Thanks again everyone! any thoughts on TacT versus Lyngdorf versus some of the RCS systems built in on the newer pre/pros (Anthem D2, Integra 9.9, Classe)?

My living room is far from ideal for good sound reinforcement, as there is lots of glass, stone chimney, wood floors, etc., and I will not 'decorate' the room with lots of audio panels. I decided about a year go to try the Tact 2.2XP; it completely transformed the sound. No longer is there boomy bass, shrill treble and depressed midrange. I should mention that it takes a lot of time and patience to understand the unit, it's software, and much tweaking until it's 'right'; it certainly was not plug-n-play for me! However, it was certainly worth it in the end. I also found that using a good external DAC (I use a Lector Tube DAC) makes a substantial difference over Tact's internal one (for the main speakers; it's fine for subwoofers).

TacT versus Lyngdorf. Good question, especially as they were recently partners in the same company (Tact).
My tech says that Tact (Baz) tries to accomplish more correction parameters than Lyngdorf with the result that the Tact system is more difficult to understand and apply. I would love to hear the specifics from someone more knowledgeable than myself.