Let me try and summarize the feedback from those that have shared their varied perspectives. Like all customers, there is a quality, cost, and speed (effort) component that usually drives any product decision.
#1 This complaint appears to be the price. Its just too high. Think of the college student or self-employed, the 95% of businesses that are not Big Fortune 1,000 firms, they need Lean Six Sigma too, they want to get trained and improve processes, but the cost to use tools like hashtag#Minitab built into curriculums is too much.
#2 There are no Lean tools in Minitab and that's a problem since Lean is at least half of Lean Six Sigma.
#3. Every time Minitab upgrades it renders previous data sets useless, It has a huge learning curve and complexity to new belts. Those are some of the major ones, but more folks are still chiming in, so i will capture their thoughts as best I can.