I have a Resolution Audio Opus 21 that I bought from GNSC and used for about a year before asking Steve to perform the Reference level modification. I felt that the Opus 21 "fights above its weight" in that it sounds lots better than other comparably priced players. I wasn't dissatisfied with the stock unit but after talking through the reference mods with Steve, I trusted him to proceed. I also knew that Resolution Audio supports Steve's efforts. GNSC and Jeff Kalt have a good relationship and I was persuaded to have GNSC modify the unit understanding that if something went wrong, I was unlikely to face Resolution Audio blaming GNSC and vice versa; those guys would cooperate and get any problem solved. Add to that GNSC's reputation for customer service; I plunged in.
The modified unit sounds great. I noted particular improvements in deep bass performance and dynamics. There were other improvements across the spectrum, including improved midrange. In short, it sounds more like real music.
Having no experience with TRL, I do not want to discourage anyone from dealing with an outfit that might be great. GNSC is, however, a well known quantity. I have absolute confidence in Steve and have had great experiences with him. You won't go wrong with a GNSC Opus 21 purchase and mod.
The modified unit sounds great. I noted particular improvements in deep bass performance and dynamics. There were other improvements across the spectrum, including improved midrange. In short, it sounds more like real music.
Having no experience with TRL, I do not want to discourage anyone from dealing with an outfit that might be great. GNSC is, however, a well known quantity. I have absolute confidence in Steve and have had great experiences with him. You won't go wrong with a GNSC Opus 21 purchase and mod.