Ball screws for machines in that price range are likely to be rolled and not ground, and thus not much better than lead screws. Even the townlabs website admits up to 0.003" backlash for ballscrews (w/o preload), which really you can do better than on a Taig.
The problem with ball screws on a machine that size is they backdrive, so you need more powerful motors, meaning everything gets more expensive. On the other hand, you can drive the hell out of smaller stepper motors with a good driver like the one deepgrove1 provides. I can get 80 IPM rapids on my Taig, very low backlash, and I cut titanium and stainless without a hitch. I don't miss steps either.
Yes it's not terribly elegant but it works very well.