I'm building the Epsilon 60 now and have the 40 on backorder. MY Widebody 40 is incredible. I've flown a WB 60 for a while. They are all fun to build and are very good pattern planes.

Sometimes, there are a lot of difference between something like the 11x5 and 11x6. There are too many reasons to predict how a certain prop will fly a certain plane. You just have to find the one that is best for your model and keep the props that don't work well. You may need to try something like an APC 12.25x3.75 for real vertical. This is a good vertical prop for .46 engines. It is a matter of putting one on and seeing how you like it. There are times that a prop will fly poorly and it doesn't make sense.