Sorry. Can't answer this without really being offending to the orginal poster. My son does TaeKwonDo...he's 4...he does it to get rid of energy. For me it offers nothing practical, in the street or in the octagon. Granted you will develop powerful kicks but other than that. Not much else. The kicking techniques are well telegraphed and to make it work in any shape or form you have to be ridiculously good at it.
When you said you have 'done' taekwondo i am assuming you've had a few lessons, got a couple of grades and think its the mutts nuts. It looks good..but trust me son, don't depend on it in a real go. You'll learn a harsh lesson.

I've sparred with a supposed TKD black belt, style against style and the only other style i found easier to overcome was wing chun.

Like all things though. Opinions vary