I downloaded it after Google bought it to replace the version 1 I bought long before and must say, never really used it much. If they start charging I will probably pass on it unless they add some compelling additions. Last week I did save an otherwise noisy low light portrait with dFine but PS can do a better job if one takes the time.
My two best image software investments have been LR and PS and once the investment in time to learn PS to a level that is not more destructive than without it, it becomes very powerful but a never ending learning commitment. I doubt many except hard core professional photo retouchers do it justice.