There's so much to like about Open Studio, but most importantly the piano instructors are very enthusiastic and inspiring (in addition to being very talented). I follow the courses in addition to traditional piano lessons and so far it's worked out great. I don't know if I'd recommend it to complete beginners as their sole means of instruction, because it's still important to get personal feedback on small things (posture, touch, etc.). I also still recommend that aspiring jazz pianists look for opportunities to play with others, as there's only so much you can learn from an online community, but this by no means detracts from what Open Studio offers. The most important recommendation I have (hence the four stars) is that an app should be a no-brainer. The organisation of the courses via the website isn't always incredibly clear or easy to navigate and a decent iOS or Android app should make the experience even better.