It's not out yet. I think it'll be around July.
I don't believe it will be good for groups, though. I see it as a "practice away from a power-line amp".
Anyway, I wanted it for the summer so waiting July (and probably some more until it reaches retailers here) wasn't an option, so yesterday I ordered the bass amplug, along with that funny little cabinet accessory (though I don't know if that will be audible over the sound of my breath).
For 3-4 people, you might want to look into these:
1) Pignose Hog-30 (30 watts ~160$). If I had the money and it was a bit easier to find outside of the US, I'd go for this.
2) Roland micro cube (5 watts ~200$).
3) Roland mobile cube (5 watts, not bass specific, but may do the job, around 120$)
4) Thomann's HBAC-30 (30 watts, ~90-100€, depending on VAT. It's an acoustic instrument amp, but the 8" speaker may handle bass better than Roland's 5" speakers that the cubes have. One problem is the weight : around 10kgs)
5) Vox Amplug + cabinet (0.7 watts, 60-65 $. You'll have to only play interludes, though, while your friends are resting

)