To be frank, It's a nice idea but other plug-ins do similar things such as http://www.oxwall.org/store/item/166 for WAY less of a price such as let you know who visited your profile last, this includes friends and guests looking at it.
5$ tops for just having a counter on your profile. these days you can get counters for sites free all over the place.
3 things that would help make this 15$
1. List shows each person who visited the profile in order.
2. choosing rather guest visits are counted or not
3. adding a widget showing who is most viewed
This is just a product first look review by me since the product created sought after me via Oxwall mailbox.
Feel free to buy it and try it yourself.