Don Assenheimer is a fine bowyer. You can do a search on this site and pick up quite a few references to him and his reputation.
You are correct, he only makes 3 piece take-down recurves and has perfected his design to deliver the most bow for the buck that I have found anywhere.
I have a 2006 Assenheimer bow with 2 sets of limbs (46 & 54 @ 28"). I also have, or have had Black Widow, Acadian Woods, and Martin recurves. My favorite bow of all is the Assenheimer because of the qualities you mentioned, and because the design fits me.
Mr & Mrs. Assenheimer are great to work with and they keep their promises.