We used a paid version of SM for a few customer and prospect reviews over the last year. Often wasted hours trying to do something simple (e.g. Repeat a test run with the same recipients when fine-tuning a survey) only to find that this basic function is only available in the 'Enterprise' edition.
This isn't a bug - it's cynical price-gouging.
The company doesn't deserve its customers' business. We're going elsewhere.