Virginia,
"Nasty" is, I feel, a little harsh. Its not the easiest to fly but it is more comfortable, waterproof, has space for luggage behind the seats, doesn't write off props all the time, (pusher config), has a real turn and slip indicator, ( a piece of wool on the canopy), and isn't fabric covered. I agree that the Falke is better for instructing. The Ogar is OK for a private owner. With a clued up private owner who can apply some TLC it could be very good.
If a single seater is acceptable then there's no question, an RF is perfect. If the cash is there, a 109 is better than the Ogar due to the wobbly prop and if money is no object the Dimona is great. The ultimate of course is the Stemme if you want motor touring performance with self launching glider gliding performance as well. I have assumed that it's Touring Motor Gliders being considered here though.
Mike W