Wow, have to thank all of you. I bet I have read that app note 3 or 4 times in the past. Problem was, when I read it I wasn't looking for a bi-polar drive. Now for the past 5 months I have been putting together a 6 axis drive for 2A bi-polar/uni-polar steppers. I settled on a uni drive for convineance and price. This is a worthwhile drive circuit, deserving much deeper look.

So far, it looks to be both cost effective and manufacturable!

So again, thanks! Now as I develop this further, should I start a new thread or continue this one?