lol actually I have hehe
like I said, as long as the curves are relatively large (larger angles) then its pretty simple, just take your time and make some grooves before really digging into the cut
just remember that when your cutting a curve, you can always just overcut into the area that will be cut out. ugly cuts are easy to fix if the letters are big, since you can just use a grinder and grind out a nice curve.
I realize its not that good, but its my first time doing any intricate cuts lol, I'll be going over everything with a rounded file soon to make it look more uniform. And yes... the font is supposed to look really whack!
Heres a mesh grill I cut out which has rounded corners (didn't have a jigsaw at the time)
Covered with u-channel = looks uber pro lol