I did my first gig with mine yesterday.
Just a jazz gig, but in a rather strange shaped and very much larger than expected room. It was a cobble floored courtyard, with a very high glass atrium roof. Really nice atmosphere.
I took a spare cable just in case I needed to DI into the PA, but it wasn't needed, the Double Four coped admirably. The sound was rich and deep, not at all what you'd expect from such a tiny little box.
We were playing with 2 other bands, the bassist from the band that followed us asked if he could play through it, giving me the perfect opportunity to hear it myself. I have to say I was impressed.