This anime has its ups and downs. However after 10 episodes or so it mostly just going downhill. The characters are cute and likable, I especially liked Ginji. The OST isn't anything special but not terrible either, same can be said for animation. There are also alot of anime clichés to be found in the series, verything from characters to places really (like the Honky-Tonk bar).
If you liked Hunter X Hunter you'll probably like this one, it has the super powers where scientific explantations don't really matter and it shares the same slow-but-steady pace.
In the end I'd give this anime a 5.5/10, I found it to be watchable but it won't go well everyone.