It also serializes the model and results to disk by default. This is great for loading up the model later on another, possibly less performant, machine and performing your classification / etc...
Of course PyLearn2 covers this feature set and more, but isn't as easy to get started with.
I'll make an effort to use this when I can, unfortunately my two current projects involve a convolutional neural net and an auto encoder. :(
TL; DR: Specifying structure using YAML instead of coding neural net. Working at a higher level than other libs such as Theano.