It is very user friendly software which gives good results with no errors at all time even when I am using it for only 20 minutes or so! Its free to use but there may be some limitations sometimes while you are uploading your raster file if its size surpasses certain limits then everything will crash out from that moment until next restarting process; otherwise not really any problems encountered as far i know..it's pretty reliable tool definitely worth giving tryout!! My work gets done much faster because this program does almost every thing my other programs do plus more efficiently than anything else ever known before now.