Best free comment plugin around?

In my opinion this is by far the best comment plugin around.
Extremely flexible, great design and lots of extra features (even in the free version).
Buying all the addons would be expensive, but for the average website the free version is more than enough.
I had just spent a whole day customizing another plugin, but when I had a chance to test this I switched immediately, these guys know what they are doing and offer great support too.
Recommended!