I bought myself a Fly 3 some weeks ago. Definitely the smallest amp I ever got...
Even though I do not intend to use it as a recording amp, I made a short demo song of the Fly in a multitracking context - drums, bass, and about 8 guitar tracks, all of them recorded only with the Fly 3 (i.e. without the aid of FX pedals, external speakers, and so forth):
The recording "setup" is shown in the picture (please ignore the marmelade - this is not a new Tube Screamer design, but just a way to demonstrate the amp's size). Note that the delay on some guitars is added afterwards, so this is not the built-in delay. But at least you could create a similar delay using the amp's own delay...