I haven't shot that particular model of Widow, but I can agree with the statements regarding the RER Arroyo series. An incredible level of craftsmen-ship goes into those bows, and even the basic models are suprizingly quick for what you expect. Apples to Apples comparison would be difficult without both present side by side, but after visiting with Kevin and Sue and shooting the bows in their basement I would not hesistate to recommend an RER bow to anyone.
The 54" shoots like a 58" - you are warned. :D
Personally I perfered the Vortex series handle over the Arroyo, but if you're interested in the performance of the Arroyo and the slim pointable grip of the Vortex, look at their new takedown. It offers the best of both worlds.