I think you are able to try some of the chess mentor lessons before upgrading. I tried it out yesterday without a membership and was able to do 20 lessons before it said I needed a membership to continue.
Today I was able to do exactly 3 lessons before it started to complain.
I've done roughly 70 lessons so far, 5 complete courses over 3 days lol.
Haha I'm curious too as I was thinking to upgrading to diamond. But if you can do that many "lessons" with platinum, a platinum membership would be enough for me.
Just curious as to what constitutes a lesson. Is it one course, or is it one lesson in a particular course?
Not complaining here, but I'm a Platinum member and have completed all 10 lessons in the Intermediate: Chess Openings Course, so I'm getting way above the 5 lessons pers day.