I have run into the problem of having to have at least 25 hrs in make and model to instruct from certain insurance companies. While this isn't a legal req. if something happens to the plane the insurance company probably won't cover it. Tell me if you really think its worth the risk? The diamonds aren't hard to learn systems wise but they do have a few handling quirks.

Now on the FAR side you must have 5 hours in MAKE AND MODEL to instruct as sundog said... its FAR 61.195(f).... Hope that helps