I have just received a comment to my post regarding wp-spamfree and decided to do a search for other users of wp-spamfree who had had problems.
StevoFC has some negative comments but didn’t really look into the cause of the problems. If he had done a little research to find out why the comments were being blocked it would have been helpful.
I have found a couple more articles with a few negative comments but the overall feel is that wp-spamfree works and is effective.
However, a couple of posts have brought to my attention NoSpamNX which I will be trying out next. I will initially leave wp-spamfree on all of my blogs except this one which will move over to NoSpamNX. I will post again in a week or two with updates.