There are two basic types of laksa, curry laksa and asam laksa. Curry laksa is a coconut-based curry soup while Asam laksa is sour fish based soup.
This is a version Thai version of curry laksa based on green curry. It is quite popular now in Penang and can be quite widely found. I've tasted the Thai laksa located at Swee Hong kopitiam at Pulau Tikus and also Tesco Glugor foodcourt.
Spicy, Hot, Sweet is what I used to describe this laksa dish. If you're not used to the authentic Thai cuisine, then get prepared as you will most likely end up with Rihanna's lips. Recommended to have 3 cups of ice water ready as back-up. Seriously it is damn hot.