This is a great way of experimenting with sounds, pedals and effects. Personally, I am using to decide what pedals to buy for my sound.
Works really well with ToneBridge app as well as deplike. Also works as an OK interface for recording with apps on iPhones or Android.
I was using a Line 6 X3 some years ago until I met the amplitube technology, so I toss off the Line 6. The advantages from emulations is that the software can be upgraded, not that way the hardware, that is limited to the built-in components. Recently, I also got Bias FX and all their libraries like Bias Pedal, Bias Amp and Bias Delay, all them highly customizable but still I like Amplitube because the Fender collection and the general app tone, though it lacks of effects. I hope for Bias Fx to make any update soon and improve the algorithm.