I have a few logo making tools (some LTD some not). I ended up using mojomox for my own logo for 2 reasons:

1. It incorporates the letters of a company into the design. I have logoflow which does not do this. It only works with icons.
2. The result has a high quality look to it which I really dig.

The brand kit stuff is pretty cool as well. I can see this used for clients.

Areas I'd like to see improved is to allow more customization options. Like if I want to add an icon in place of a letter. I cannot do that currently. Also the spacing and placement can use more work, a drag & drop system would be nice. Adjusting X and Y was tough when you add rotation to the mix.