I had that plane, it was great. It got me in the air in smaller spaces but it needs very low winds to fly, it’s super light and is easily blown away.
Safe/as3x does work well, but it will teach you a few bad habits that can take time to shift when you want to step up to something else. The intermediate mode on the Sport Cub is really hard to fly in. I found it needed lots of tweaking to stop the software pitching the nose up and stalling all the time. It’s less of a problem in advanced. The motors on the Sport Cub also wear out fast. My first one lasted 4 weeks, flying three times a week.
For the price of that you could build and equip an FT kit plane like the Simple Scout, Cub, Tiny Trainer or buy a cheaper RTF like the
Wiltoys 949 which is a basic 3 channel trainer RTF for 1/3rd the price of the Sport Cub.
If you build an FT plane (I like the Tiny Trainer for starting) then it’s easy to repair with spare foamboard, you can fix crash damage cheaply and the radio equipment can be transferred to new planes when you move on or one is destroyed. The TT can be built as a chuck glider, 2ch glider, 3ch powered trainer or 4ch which will do full acrobatics.