Auraliti PK100

" ...they have not been responsive to emails."

If so then forget about them. Too bad as design seem to me superb - I prefer PK90 over PK100...but if company does not respond on simple inquiry then its "huge red flag" in my book.

I was planning to e-mail to them soon and I will do it probably tomorrow and will report results here

I just got a PK90. I also e-mailed them numerous times and always got a response from Ray. Sometimes it was quick, and sometimes a few days. Everything A-OK with these guys, I just think they are busy, and are a very small company.
The PK90 works great, but I can't give you a review as I also got a new DAC and cables at the same time. Bottom line: I like it, and it was a good value!

Good to hear about your experience. I know that they're a small start-up company and have limited resources. What's the quality of the power supply? I read previously about a power supply upgrade but I don't see it on their website.

I used a Logitech Touch previously and know that Bolder offers a "Linear" power supply. The stock Touch is good (for it price) but didn't improve my digital front-end.

The power supply is a little box that has a wire from each end. One side goes to the wall and the other to the PK90. Quality?, sorry I haven't taken it apart, plus I wouldn't know what I was looking at. I do know it needs 12VDC so maybe you could use a car battery.

A few days ago, I also asked them a few questions - no response yet. May be its too early but still irritating.