Bottom line: If you can get away with free version good but don't pay for the upgrade.
This plugin has very limited function, no doubt, to get people to the Professional version. The Pro version seems to have a bunch of little issues: short codes don't work, pricing does not show up in store, little HTML errors in places.
On one hand, I have to give Niaz a lot of credit for tying to be responsive (a little tough when you are on the other side of the planet). He has been very helpful getting it installed but, the install should not be so difficult.
On the other hand, I gotta say I am very disappointed. I needed a License Key Code to show up in the email to the customer. Did not look like this plugin could do it so I requested a refund. The response I got from Niaz was that it would be a unique requirement, he could do it for more money and I would not find another plugin that does it. Well, I found another plugin to do it, Niaz has the function already in his code, and I have not heard back from Niaz is a few days.
Also, product view needs to be separate from adding a product (too much scrolling). He uses expanding sections a bit much, some should be consolidated. The organization of the app overall is a bit weak: Product Categories should probably be with Add Products instead of Settings, same with eMial and Text notification. Makes more sense to have email and text variable by product.