Although there's no way a tablet DAW can manage the features and power of the best computer DAWs, I was nonetheless very impressed by how much WaveMachine Labs packed into an iPad app!
And of course the tablet format has advantages that computer DAWs lack, such as a multitouch display, an even easier portability than a laptop, and an App store price of $49.99.
Plug-in maker PSP had a hand in designing Auria's effects. More here:
Auria the first 48 track digital audio workstation for iPad by WaveMachine Labs inc.