Mick - I am on an I5 Imac with 16GB of RAM and did not do the Sierra jump as I don't want to talk to my computer and I don't have an iphone <smile> so still on El Cap. I have not had a crash as yet but slow slider function have some lag to them with image update but that might be my computer's age showing. Yes no crop is a bit of a drag and also looking forward to the full release. I understand why but still bummed that the Photo 10 presets can be converted over I have some standards I created and will now have to re-create based on the changes. Some functions have been moved from Enhance to Effects. Over the next couple of weeks it will be interesting to see if I pick up some speed. I think they need to tweak the base profiles my gut says they have the develop tonal balance cranked up to high and starting points of exposure/blacks and whites seem a bit contrasty. Would also like to see the Kelvin numbers on the temp slider verses an arbitrary numbering scheme. But have always found a use for their products even as plugins.