For my money (and I do donate every month to Language Transfer, because all the content is completely free) this is the best system for actually learning to use a language, as opposed to memorizing words and phrases.
You can do it with YouTube audio, SoundCloud MP3s, or the convenient app that does what it needs to without any extra bells in whistles.
Thanks for the additional information. Everything newer seems to be Rotax now. Except there was one guy who had a Corvette engine in his Cessna. Other pilots were talking about how it has so much torque his rudder isn't big enough to compensate.
Hopefully in 5 or 10 years, everything will be electric!