Simple and refreshing plugin vs the available graphics overkill stats...
Couple of enhancements might however be interesting (without losing the "simple" aspect:
1) under settings an extra flag to swith the extra info logging on/of for user agent, redirection and other stuff)
(this will make the overview rows lesser in hight and easier to read when dealing with many registered users that login/out)
2) a counter that indicates for each (filtered) overview the number of succesful logins and number of unsuccesful logins
3) For the CSV export, would be better to export the login status as a separate column instead of now as part of a larger string.