That's a tough question, sully. They've been in business for approximately 10 years and although they're not able to replicate the original artwork on ANY of their hundreds of released titles, I find it odd that not one of the record companies have shut it down yet for infringement/piracy concerns.
Regarding quality: The fact that they're duplicated from either LPs or Open Reels would seem to indicate that they're operating independently of any royalty payments and yes, some of their releases are indigenous to them as they SEEM to be duplicated from sanctioned sources and IMO, on a good system, they're 'reasonable' facsimiles of the source material but then again, hardly indicative of the original master tapes.
One almost wishes that the big wig conglomerates would enlist their services to duplicate master tape source material as we know or should know that the record companies have NO intentions of releasing them on physical disc. IMO, some of them are true classic treasures and if this is all we have, then I'm IN.
I own about 50 of their earnest bootlegs [if that's the proper term] and IF the majors did release these titles on bona fide hi res physical disc, I would certainly PREFER the sanctioned release.
Ssully, I know I didn't answer your question but until Universal Music or SONY [which MOST of their recordings are sourced from] shuts down HDDT Tracks once and for all, I guess we'll never know.
The one caveat: They're utilizing TOP, TOP duplicating equipment and the sounds they elicit from these Open Reels sounds heads above any sound I ever experienced from 1970/80's era Open Reel tape Decks. And with the choice of DSD, DVD~A 192/24/DVD~A 96/24, etc. and some very magnificent BD~A discs, it's certainly somewhat better than the DVD~V DTS/DD 5.1 LOSSY 'masters' currently 'peddled' by the major conglomerates!