I found this for anyone else who might be interested in the miniONE.
http://www.karlclews.com/blog/gear-part-10-gr-bass-mini-one
In summary "...the Mini One performed admirably on the gigs. As a class D head, it’s fine to run it without a cab, so as planned, I simply plugged it directly into the PA. Since then, I’ve used it on a number of local gigs, driving my Epifani UL 410, and the 350 watts it puts out are plenty for most gigs - anything where you need more than 350 watts, you would tend to be putting the bass through the PA in any case. The sound of the Mini One is beautifully transparent - it doesn’t appear to colour the inherent tone of my basses at all, which is exactly how I like my amps to work! In comparison with the Genz Benz Shuttles, the bottom end of the Mini One feels more focused, and the mids are very punchy, so slap and more percussive fingerstyle cut through the mix very well. And the top end is nice and airy, and you really have to dial it way up before it starts to get harsh and brittle. All in all, it’s a fantastic little amp, and the tight, focused bottom end and distinctively punchy mids make it sound much, much bigger than its tiny size and 350 watts..."