I've been using it for about 18 months, works very well for my modest needs (stitching panoramas, HDR stacking, occasionally removing an unwanted person or thing from a photo). Most of the shortcuts and much of the interface is just like Ps, even to the point where many Ps tutorials/techniques just work.
The one area where I'd say it needs improvement is the raw development. The output just isn't that great compared to Adobe Camera Raw or (my tool of choice) Capture One.
