Personally, I will use as many tools as possible, to understand the traffic patterns of my website. Your plugin does a fantastic job, painting a measurable picture, that is easy to understand.
I'm also one to use a plugin to replace multiple plug-ins. For instance, after installing your plugin, there isn't much need for the WP-log-robots plugin. While it is a solid plugin, I am more apt to use a plugin with more features and functionality, especially if they are beneficial features and functionality.
Based on everything your plugin already does, I would like to suggest a couple improvements. Yes, these improvements would be beneficial to me, but after you read my suggestions, I think you'll see that they will benefit many, many others as well.
- Build in optional functionality, equivalent to that offered in the WP-UserAgent plugin. This should not be that complicated as your plugin already tracks the UA of every visitor. The only addition would be the ability to turn on/off the posting of that information and how it is organized/displayed, on posted comments.
- Build in optional functionality, equivalent to that offered in the WP-UserOnline plugin. Again, this shouldn't be that complicated as your plugin already tracks when visitors visit the page, and who the visitor is. The only addition would be the ability to display that visitor information in a widget of some sort, showing bots, guests and logged-in users.
- Finally, build in optional functionality, equivalent to that offered in the Register IP - MultiSiteplugin. Your plugin already logs the IP Addresses, so adding the ability to view the signup IP, in a column, of a user, in the USER ADMINISTRATION area and the ability to block that IP from being able to sign up in the future, shouldn't be that big of a deal.
With the quality of your plugin, to this point, I feel sure it could offer even more benefit, to even more people, with the addition of these three features.