Michael - that Berghaus should be an interesting product once it hits the market, for sure - mostly because of the cut, the technique chosen for main baffling, and the use of hydrophobic down. I do question how efficient the offset style of baffling is compared to the box-stitch method, but it is easy enough to see that it is more thermally efficient compared stitch-through. Given the overall weight and fill weight, it's an obvious competitor to the Rab Infinity, but the quoted price would leave it quite a bit more expensive (300GBP is about 460US$) - but assuming hydrobphobic down truly is the holy grail of insulation, then that cost might be worth it.
Back to the infinity vs. bitterroot discussion - I've already voiced my preference in earlier threads, but it's probably worth repeating here: in my experience, the hood in the bitterroot was major disappointment - just too big and unwieldy considering that it is nonadjustable (although it might be better for taller folks). Also, for my body-type, the rab was a better, more technical fit. Both jackets are very well made - great materials and construction for each.