I was given one several years ago.
I used it (Wulff) to help teach my son and wife. It seems to let beginners understand the casting process more quickly.
I also used it last month to teach middle school students (10 of them) some basic fly fishing. I do not know what impact the practice rod had, but they all caught at least one fish (bream).
For an adult with some experience, I would think that the money would be better spent with a casting instructor.