I have been looking at the World Models Spot On 50. I have An OS 70 Surpass engine that needs a good home. I have read mostly good things on here about World Models ARFs and I would like to hear from all who have built AND flown this model using a four stroke like the OS 70 Surpass or similar. Things like;

1. ARF quality, structural design, and hardware quality?
2. Easy build?
3. Build Problems or mods and improvements you felt had to be made? (detail photos welcome)
4. Did you mount engine inverted or sideways? Problems or suggestions here?
5. Hardware quality or problems?
6. How did it perform with 70 Four Stroke or similar?
7. Flight performance, ie tracking, aerobatic capabilities, stall characteristics, high speed, low speed, etc
8. Flight problems.
9. If you've had it a while, how is it holding up? ie, LG, cowling, hardware, structure, etc.

At $130.00 looks nice and is tempting, but is there something you now you really wish you had spent $30.00 more for? What would that be?