the funtana 3D or 40 is great it was my first 3D plane but comparing it beside the funtana 90 the the 90 is total better but put an aft cg on the 40 size and you will have a great time but you will notice its a bit mor jittery and touchy on the controls all i can say it bigger is better and that 100 will do perfectly on the 90 funtana