Having seen this mentionedo on Reddit I decided to give it a whirl, installed the plugin, ran the test in the options and then went to sleep.
This morning it had blocked over fifty comments with no problem at all.
I've seen Steve write about this on his blog a few times before I decided to try it out, and I'm glad I did.
The plugin has few options, and those that exist could do with more human-friendly explanations, rather than technical detail, but the plugin works.
In the past days I've only had to retrain a handful of comments, the plugin seems to be doing an excellent job.
Installing the plugin was just a matter of uploading it to
wp-content/plugins, and once activated it just worked.
There aren't any useful options I could see, the behaviour is just "on" or "off".
That said when it was enabled the spam comments were almost totally stopped. In the first day it dropped 400+ comments and let through around 20 legitimate ones.
No obvious mistakes yet, but it looks like you can train the good/bad comments it made a mistake on.
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