"Riverdance" and "Lord Of The Dance" are two very different shows.
This current incarnation is great if you're into that kind of thing, but ticket-buyers should probably be aware that Michael Flatley only appears for (literally) about five minutes at the very end of the show. I know it says that in the article, but I still think a lot of people will be spending the whole show wondering when he's going to show up. Always read the fine print!
Mr Roxy said: "since it has never been revived if I am correct"
You are not correct, as (per WikiPedia) it was revived back in 1975 with Irene Worth giving a Tony-winning performance in the lead role. Forty years is long enough, though, so I'll let you away with it.