Preventing Spam

I'm running elgg 2.x

I installed this "emaildomains" plugin: 

And this "elgg_recaptcha" plugin:

And this (free for a week then £6 for a year so it's very affordable) and have had really good results.

Combined they have dramatically reduced the appearance of spam and the questionable registrations.

I have not tried this plugin but woud be interested to hear if from people that have: