I have a Tower Trainer ARF and I don"t like it much for the following reasons. The tank is rather large and wedged between the formers with rubber on the side of the formers. You cannot get the tank out unless you remove the engine. The engine is not bolted directly to the mount, It has metal straps thet clamp down on the engine lugs that are then bolted to the mount. It is heavier and ,for me a little harder to fly than my PT-40. I bought the Tower as a quick replacement for my PT-40 when It went down (not my fault) and was damaged. Maybe I am just use to PT. The covering is very thin, I think it is Towercoat, and the trim will start coming loose about your forth flight. If you do not use the tower engine you will have trouble attaching the fuel line after fueling. The fuel line exits the firewall in the middle of the mount under the engine and then routed to the remote needle valve. I have a Magnum and the nipple does not point upward (like the Tower), rather in, paralell to the firewall. It is difficult to get your fingers in to attach the fuel line. I built my PT-40 from the plans and used the kit for patterns before I sold it. I took out some dihedral, about 2 inches overall. If you are building a kit, I would recommend the PT-40. If you are getting an ARF I would recommend the Lanier Explorer. Some of the guys in our club bought them to enter the trainer races we have each month and they like them. As I said, it my be just that I am use to the PT-40, but I find some of the things mentioned above, annoying. Hope this is helpful. BTW...I flew my PT-40 and Tower Trainer at half throttle with a Magnum 46 so the FP35 will fly them but takeoffs might be a problem....The Lanier is lighter than both of them.