The best part about LightY was its great documentation which allowed me as an SDn developer who has been using Cacti for some years now transition very smoothly from cactus into this new tool! Nothing really at least yet since I am still exploring it but so far everything looks good though nothing much have came up that would make people dislike or stop us liking their product because there's no such thing unfortunately till date!! If you are looking outfor one solution then give them try they will not let disappoint u.
! So many features available like load balancing across multiple servers with sticky sessions etc. There were few issues while migrating our existing traffic flows over here however we managed those somehow without any major downtime thankfully! One word - awesome!! We needed something simple where i could easily set all things required under LighIo platform including my own scripts written inside Python language itself along side other tools used within same project/code base epecially when doing D.