The function itself is pretty decent for a Photoshop Tool Clone. UI is quite snappy even when loading. What I noticed is that at high res images , zooming in is quite laggy. Also , add a small tutorial as it might be frustrating for non PS users to understand how tu use it. Also , results involving high res images are quite psychedelic to say the least. Would not pay 20 $ for a PS function that works so bad on high res.