Saw one fly with an MVVS91 over the weekend ... its was fast enough but if you really want speed then go for a cheap TT120 turning a 12x8 or 12x10 prop! But this will make the plane nose heavy for sure. The one I saw was just right with the MVVS91. Seeing her fly I would say she handles nice but landing and take offs are a pain, she will tend to tip over, you will need to bend the UC farther forward if you have fixed landing gear.