Lots of great tips. In addition to platform features, I'd also make sure sections on solutions, support / uptime SLA, security/spam control and services (moderation, professional services..etc) are included. Platform feature checkbox matrix is important, but it can also be misleading without verbose information in business values that can't be quantified in a binary checkbox selection. For example, many vendors do not offer terms-of-use moderation service. Depending on how big your community is, that may be a serious consideration which can impact your internal resources/headcount/budget.
Cheers,
ac
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