Mike,
I got the Hawk model. Only difference between the two models is that on the Eagle you can plug in two handpieces, but you can only heat one at a time. Burnmaster also has a new pen that accepts replaceable tips from the four major makers. The good thing about the pen with the replaceable tips is that the tips are connected by screws that make a tight electrical connection. Burnmaster has a three year warranty.
Looks to me like the nibsburner is rather pricey for what you get. It may be worth it. I haven't had any experience with it and don't know anyone else who has.
But when a person who is a full time artist in woodburning recommends a particular brand, I sit up and take notice.
Danny