Just don't expect to be using those shiny numbers for anything but scientific computing (and most specifically when involving large matrices). Their namespacing and modularity is terrible, writing a complex gui, non-trivial web server, 3d renderer, or any sort of real time system is right out. And they seem dead set against changing that (did I mention they ban people for making too much noise about it). But if you want to simulate something over a cluster it's a great choice.
I should probably note that I have a poor opinion of their community from my observations (they are hilariously salty), I may be a bit biased.