Sounds very good and I guess this is indeed a good practice setup if you start playing these days. Concerning me I play instruments since a very long time (I am no longer the youngest ;-) ) and have therefore invested a lot into Amazing Slow Downer. I have probably about a thousand loops from songs I have studied and/or played along at some point in time. This represents a considerable investment, but unfortunately without a possibility to use that easily with other software. Thus switching to another system starting all over again, is not something that would be easy to do for me.
BTW, I have also looked at AnyTune and found it quite well done. Especially the soundwave pictures I find useful when looking for loops. However, the quality of the slow downed music I found noticeably inferior to Amazing Slowdowner. I didn't bother to go Pro or whatever that extra costs level is called. It just made me suspicious. I paid for the program, yet the sound quality is meagre. With Amazing Slowdowner I paid once the license fee, many, many years ago and I still get upgrades and the sound quality is the best from the very beginning.
But as I said, this has much to do with the investment I have been making. I wish I could export all those settings for reuse. Might have to write to Roni Music on this. On the other hand I find myself still returning to the Mac, despite my iPad and iPhone, since it is still the most versatile machine there is to maintain notes, tabs, pdf's, song texts, MIDI tracks, audio recordings, and Amazing Slowdowner settings, which all can be organized, watched and edited almost all at the same time, limited only by my screen estate. ;-)
Cheers,
Andreas flf