Anybody use Dynamic Racing flywheels?

Ebay has these billet steel flywheels for around $120.00. I am starting to gather parts for a T5 conversion and found them. Any good?

Also, I have read all I can find about the swap. I am trying to find as much as I can used and buy a new T5 unless someone vouches for a good rebuilder who has them in stock.

Thanks!