This is a great component. I've used number of free components and commercial components. It'd say this component is bang for the buck.

Beside the great functionality jreviews provide, what I really like is the community base and the superb support. Whenever I post a question, I can be assured to get a response very quickly.

The installation is quick and easy. It's a good plugin. For those of you want to get rid of the 1">, the code is in invite.php. The problematic line is:
$html .= '';

You can do the following:
$val = $i % 2 + 1;
$html .= '';

Few other functions that would be nice to have is the ability to delete and/or archive the invitations that I sent, and having a "Resend" button for each invitation that doesn't acceptance yet.

But overall, great work. thanks!