Strengths: 1) Simplicity. I have a few other bikes, all bar one of them more high-tech than this, but the cruiser is the one that trundles me happily around town most often.
2) Taught me how to strip down and rebuild a coaster brake!
3) Longevity: I didn't touch the coaster for 6 years.
Weaknesses: Rubbish at cross racing. No, really; it is.
It doesn't get more simple – or more fun. (Yes, of course that should be 'simpler'. But it didn't read as well.)