The Z8 is pretty good. I compared it with the RS150b (since they are using the same DAC chip). It has some aspects, such as bass rendition, etc, even more impressive. IMO, it just lose a tiny margin to the RS150b in terms of overall sound quality. Surely there are many features on the RS150b which Z8 doesn’t have.
No, I didn’t try other DAC. I had the Weiss DAC502 before but it was sold longer before I got the RS130. Definitely the Weiss DAC is better.
As said, I only exchanged the RS150b with RS130 in less than a month. So far I am happy with the RS130+Z8 combo. Might consider a DAC upgrade in future.
My speakers are Whafedale Elysian 4.