I have one (it was required for a class I took with Bonnie), use it and like it, but there you may have other tools that will do the same. The Essential Triangle Tool combines the Easy Angle and Companion Angle - which were what Bonnie used before designing her tool. I think there are similar by Eleanor Burns, but don't know what they are called.
Do you have the pattern? Bonnie's patterns usually give alternate methods for cutting.