The projector: lots of customizability in terms of colors/blends, the stars, the moon, frequency of appearance of the aforementioned and so on; I've thoroughly enjoyed the projector's gorgeous color possibilities. No joke: my home office takes on a beautifully ethereal quality (with some nice surround sound to augment the experience).
A few small things, ones that aren't too big of a deal: the instructions are, perhaps, a little challenging to follow at times, both in wording and in the remote...