I recently visited the link you posted above and downloaded and installed the latest version of the WFA (1.4.0.43). It's a great tool, but I've experienced a few things that might be bugs, or perhaps I'm doing something wrong. (Please tell me if it's the latter)
The Best Practices Analyzer flags the following:
Any state machine, even if it simply contains an End State Machine action in each state.
"Detected a state machine missing change state action configured to exit: True."
Update Item actions in series, without a Commit Pending Changes action between each one. One Commit action after the last Update Item isn't sufficient.
"Correctly handles batched actions: False"
Copy Item actions in parallel legs of a Switch action, unless each leg contains its own Commit Pending Changes action. One Commit action after the switch isn't sufficient.