No kidding...I just did a 4 week rotation where I did TB once a week, too! I finished in Monday.
I'd only ever done TB once before, so it was about time for me to get around to it. Like you, I also saw progress, but I still had to take an extra break just after you finish the pulses where your leg in a L and you move it back and forth. It's closer to the end of the workout, but I can't start on the other leg without a longer rest than Cathe gives because my hip on my non-working leg feels like it's just short of cramping. But, the first week I needed more breaks and couldn't keep my leg as high, and it HURT. I actually uttered the word "Mommy." (That's our little secret!). FYI, I lent this workout to somebody who couldn't make it through the warm up, whereupon I nicknamed it TortureBarre.
So, next week I'm moving on to a new LB workout...haven't decided which one yet. Was thinking LBB, since this is also one I have only done once, although I remember liking it. But then plyolegs is calling my name. And I have, but have never done TBT Lower Body, SH lower body, Pure Strength, or Pyramids LB. I bought lots of Cathe DVDs all at one time, but it was right when i started STS, so it's not for lack of desire, just lack of time.
Any recommendations? FYI, for now I've decided to pick a LB workout and do it for a month before moving on to the next one so I can see how it affects my body, how I improve, etc.