Denw,
I agree with Eric. They are tougher to fly but really good practice. Balance is very important, you have to hit the point were they will fly at high speed but want to drop into a hang at low speed. Also the line tension is usually less so the feel is quite different than a profile. If you can get through the beginning and learn to fly the 15 well when you move to profile things get easier.
Don't forget to offset the wheels some so the plane doesn't crab on take off. With fixed lead out postion there is a tendancy to have the lines as far back as you can for low speed and at take off that puts the plane at an odd angle. Just skew the wheels slightly so the plane rolls somewhat straight. It looks wierd but it works.
Be patient, the little planes take some time to get working right.
Bob