We went through YC's Startup School and felt we are in the right place: focus on work, talking to users, no fuss, no time wasted.
The thing we felt contributed most to our evolution as a product was the weekly chat with fellow founders. After every session we felt more comfortable talking about the product, gained new insights about what people understand / or not. We had a lot of feedback coming our way, and a few teams that would love to use our product as soon as we launch. Here's our company page https://www.startupschool.org/companies/mutant
At the end of the program we applied to YC. We look up to them for a long time and we would love to be part of their program, as it would put us in the best position possible to actually build a new-generation task board, one that can actually help tech products more than post-its.