I saw those, and they look cool, but aren't they pretty expensive? If I could get one for the same price as a Focus + cab, it might be worth it. Especially since normally I would just use my pedal/DI setup, and run this into the IP only when I needed to be heard without PA.
Yes they are pricey, but you asked for the best.
I have one and I'm glad I bought it. I can play coffee shops to outdoor gigs with ease. I show up with a gig bag and roll the 310 in and I'm done.
IMO, by the time you buy a decent cab (epi 410, Accugroove) plus a nice head you are looking at nearly $2k or more anyway...