Have had it about an hour -- absolute nightmare. So far one straight up crash, and have had to kill it about 10 times. My use case? Go through one directory of fresh photos from my 10MP camera, nothing special. I randomly rotate and losslessly save and delete along the way. At some point it seems using these two operations causes something horrible to happen and it will start eating all CPU and images will take about 15 seconds to load line-by-line in slow motion. God forbid what will happen if you hit space bar when the rotate-image lossless save operation hasn't yet finished... This software has never been tested in my opinion.