Iron-on hem tape

I have one trouser leg which has come unstitched.  Somebody mentioned using hemming tape.
Have you tried this and is it easy and does it work.   Does it make the bottom of the trouser stiff. ?   Thanks Mrs Bouquet

It is easy, but the old stuff did used to make the trouser turnup a little stiff.  It's years since I used it so don't know if the stuff on sale these days is any better, sorry.