Replace the *** with the URL of a popular acoustic guitar magazine web site, and you'll find the thread Pepe is referencing.
I have a Hippner Hauser model in German spruce and birds-eye maple; I snagged it when Darren put it on e - b a y early this year, so I can't say much about working with Darren, except that he is an honest e - b a y seller, for what that's worth. I can comment on the guitar itself; for what I paid, it was a bargain. I had read that Darren builds a light guitar, and that much is certainly true. It is very light and resonant, with a quick and airy voice. Remarkable string separation, excellent intonation, lots of volume. It is not dark or romantic-sounding. More clear and bright. At first the high end seemed a little sterile and uninspired (the bass end was awesome right from the start), but some months of daily vigorous playing have really opened it up. The trebles are more responsive now, quicker and louder, and clean, clean, clean, with a sweet round flavor to them. Not a lot of overtone content on this instrument, but surprising sustain.
All in all, I'm quite happy with it. The fit and finish is not up to the standards of some; it appears that the birds-eye maple used for the lower side had two small cracks open, probably during bending or shortly after. Each is about an inch long. This is not at all uncommon in highly figured wood (especially as thin as Darren uses), and these cracks were neatly repaired before the guitar was finished. These may be the reason the guitar was sold on e - b a y, and for what I see as a bargain price. If I had commissioned the instrument from him, and paid twice as much, it might bother me. As it is, I'm all about the tone, and I have nothing to complain about there.
I hope that helps! I would, and still might, buy another guitar from Darren without hesitation.