Here are a few previous submissions - I've marked the ones that have significant discussion:
https://news.ycombinator.com/item?id=599164 (+)
https://news.ycombinator.com/item?id=1310127
https://news.ycombinator.com/item?id=1327746 (+)
https://news.ycombinator.com/item?id=1475826
https://news.ycombinator.com/item?id=3503896 (+)
https://news.ycombinator.com/item?id=3507566
https://news.ycombinator.com/item?id=4586462
https://news.ycombinator.com/item?id=5129062
https://news.ycombinator.com/item?id=5377944