I had a three week home trial of the SDAi2175 - its semi-digital integrated amp.  I've decided to keep it - I was very impressed and did not find any hardness or forwardness about the sound.  The 2 things that really stood out for me were the illusion of front-to-back stage depth, and the bass control compared to other amps I've tried with my ATC SCM12 which can be a touch ponderous in the bass otherwise.

Build quality is superb, feels like its made from a solid piece of metal. 

At the price its being offered at it, surely its got to be on people's shortlists.

Regarding cables, I got best results from it using Linn K400 bi-wire cable to the ATC SCM12s.  This was in preference to Kimber 8TC (still good though) and Chord Rumour bi-wire (shut-in constrained very bad).

However, I found pretty much the same interaction with those cables and speakers and my previous amp, so I reckon its probably more of a consideration for the speakers than for the amp.

With the home trial period available, I think people would be best off trying the TacT kit themselves rather than going on the small amount of opinion that is available so far.