there are definitely a lot of useful features in it. I might keep it just for the better thumbnail/contact sheet options.
The Zoom function has to be seen to be believed. They're using some interpolation/anti-aliasing algorithms so that pics don't look pixellated when zoomed in.
however, i have 1 problem with it... if I'm viewing a large pic larger than my screensize at actual size, i can't use my mouse to move the picture (the way acdsee does it).. have to use keyboard arrow keys. Also, when scrolling, there is some image corruption (dunno whether hardware related. i have an asus gf2mx).