I also feel that even with a somewhat low number of respondents, the results seem to be accurate. I'm basing this on what I see at HostingReviews.io and Kevin Ohashi's statement about WP Shout's results being for the most part in line with what he sees at ReviewSignal.

I want to see this survey get 500 respondents next year. I was surprised it didn't get anywhere near that many. We need to work even harder at getting the word out. It's such a rare and useful analysis.