My go-to for insomnia. Yes, there are many effective strains out there, but Mr. Nice has such a nice mellow high before dropping you into sleepy times. For me, it's the perfect night cap.
Very stimulating. Associative thoughts, talkativeness, mostly clear headed (can lose your train of thought of you have too much in one go). Fun and happy. Better for daytime or early evening. Not so much for sleepytime.