I have been exploring Heights and working my way through the course provided and am absolutely loving it. I've come back twice to add to my number of codes after seeing how easy it is to set up courses and coming up with additional product ideas.
Love:
*the easy to use interface
*the amazing tutorials
*the quick answers to my questions from support about future feature development and helpful resources
*the ability to budget in advance what growing out of the plan will mean
*the challenges and badges for gamification are SO very helpful

Excited to see what else gets rolled out over time! I highly recommend a couple extra codes as you're likely to think of additional products as soon as the deal ends :P