This is great software. I purchased it and included an extra tip to support the developer. Unfortunately, it has not been updated in a while. I emailed the author last year letting him know that I loved the software, and I hope he would continue to work on it and keep it updated. He was very nice in his reply and I have hopes that he will issue another update soon.
I suggested that it needs some basic settings such as controlling the strength of the removal. Also, as another user commented (sharkaccident), a brush where you could highlight parts to assist the AI in correct removal would be great. I love the simplicity of the software, but a few basic features added would really take it to the next level. Take a look at some popular online tools to remove backgrounds, and most of them have a few extra features to make sure the right things are being removed.
I hope the author doesn't abandon this software. All it needs is some more polish and more marketing and I know it could be very successful.