I've never heard of a power rotary cutter, I'd sure like to see one. They sound much too expensive for home use though.
I have a accuquilt go cutter and I think you could use it instead of a rotary cutter for most things, as long as the patches you want to cut are standard sizes. If you could find a quilt shop or a friend that has a die cutter you should try one out first.
This book is great to read before you buy, I wish I had bought the Sizzix Big Shot Pro instead of the GO.
http://www.amazon.com/Little-Book-Fa...rds=ebony+love
There is a facebook page called Accuquilt and beyond where people talk about die cutters. You can get a lot of good info there.
Good Luck,
cindy