This beautifully written novel tackles some of life's biggest questions. It's about the duality of lightness (freedom) and weight (responsibility), sex and love, compassion and treason, and the complexities of relationships during a time of oppression in Czechoslovakia.
Kundera's style is very pleasing, alternating between different characters and juxtaposing the time and geography of events. There is certainly some uniqueness to this novel, given all the profound philosophical reflections it inspires.
Perhaps the ultimate takeaway is that meaning can be found despite the imperfections and uncertainties of your life decisions.