This is what I looked like this weekend:
Yes, it only lasted the weekend. It is/was not a permanent change to my natural curls.
I went to get a hair cut on Thursday night, but the lady didn't know how to cut curly hair. So, she first straightened it and then cut it. Of course, I got the hair cut, after a massage and hair washing . . . so the entire process took about three hours, but only cost 14 USD (with no need to tip).
I can't complain.