Just finished giving this a spin on the record player. Someone obvious point, but it bears repeating: this is one of the greatest albums ever; guaranteed to raise a smile. If you don't have it or haven't heard it, get it today.
Stevie has quite a few classics. I love Innervisions to death, but I can't live without Songs In The Key Of Life. If I had to listen to one album for the rest of time, I think that "Songs" would suit me just fine.
Musical Genius is indeed an understatement when talking about Stevie. A bought his box set about 8-9 years ago and it stays in constant rotation in my car.