Kingy,
We disagree. I think you can land a lot slower and shorter with full flap in a 150 than without it and take off slower and shorter. In my opinion, a 150 without flaps would be partly disabled.
Genghis,
My book (the pre-1974 SC manual) gives a take-off run for the PA18-150 of 200 feet (61 metres) and a landing roll of 350 feet (107 metres). I'm guessing you're using figures there for a 50 foot height obstacle? Even so, the SC beats the Easy Raider on take-off by 100m which is a lot. Useful load for the 150 is approx 820lbs (371kg).
The Super Cub clearly beats the Easy Raider for STOL performance and carriage of useful load. Yes, it's an older aircraft and uses more fuel, but there is also a wealth of experience behind it. I'm not saying there should never be a new aircraft developed and flown, but how many hours has the Easy Raider flown and how many hours have the world's 10,000 Super Cubs and countless J3s and L4s flown? It's fair to say the flight envelope, structual integrity etc etc of the Cub family have been more thoroughly explored than the Easy Raider. For me that's a very important issue in an aircraft I may want to fly into tight situations.
QDM