I'm about to complete the Top Users per Month plugin which is made from Best Users per Month plugin of q2apro. Functionality wise there is not much difference, except that cronjob is removed. Main feature is fixing the performance bug and hence can be used on active sites. Still turning on MySQL cache is highly recommended.
Also the look and feel is improved a bit. Just need to do some final touches to it ans shall be released in a day or 2. Any enhancement requests are welcome..