I like it. What forum is it, it doesn't look like Mybb?
Why use that instead of mybb, smf, phpbb, list goes on?
Purple too light for me.
I REALLY like this forum. It's simple to use - very user-friendly in comparison with myBB. The registration process was effortless. Captchas in general always irritate me, but yours is refreshingly different and doable. The simplicity of the Forum makes it easy to post as well. I had no problem finding the right links for creating a thread and making a post. Also refreshing to see a different script than the usual myBB.
I think for your purpose, where the Forum is not meant for a major discussion forum, but more as an adjunct forum to a business it's perfect! Well done!