I'll be right up front.....I am a newbie to "this" forum and a first time poster. And, I absolutely came to this forum to respond to this particular thread. You can view this as suspicious, as it seems some do, or, as another point of view.
For my audio/video experience, I don't care what's in the box - the component. I don't care about measurements either. Typically, a good SS component will better a good tube component in measurements, but it doesn't necessarily mean better sound. I know this will upset some folks, and there's not much I can do about that. Perhaps, this is what makes me a good candidate for TUC, since I'm all about the subjective experience. We are all different and have our own preferences.
Here's what I think:
1) Since TUC does not want to reveal what they do inside a component, then folks who absolutely have to know what's inside and what is done to a component are probably not folks who want to deal with TUC.
2) If TUC does not provide measurements (I don't know if they do or not), then folks who absolutely have to know about measurements are probably not folks who want to deal with TUC.
That's it. No need to bash, because TUC does not do the above. Just move on - it's not a good fit for you. Some folks love tubes, and SS is not a good fit for them. Other folks are the opposite. Again, nothing to bash here - if it's not for you, then move on to something else. No need to keep trying to push a square peg in a round hole.
When I first contemplated getting an upgrade from TUC, I read many of the old threads (on other forums). It did kind of scare me away a bit, but then I noticed there there was only 1-2 that actually claimed a bad experience with TUC, while others were just speculating negatively about TUC. I decided to try the upgrade on a lower cost component - a used (1 year old) Pioneer BDP-05FD blu ray player. With a money back guarantee and a special deal that Dave made for me (a discounted price), I wanted to check it out. Perhaps it was curiosity - who's right? Is it the folks speaking negatively (most of whom don't have any experience), or the folks speaking positively? I guess I had to find out - and since it was low cost, I considered it a low risk for me.
When I first got the blu ray player, after TUC's mods, I was not impressed. I was comparing to my Arcam DV27a, and the Arcam still had much better video, with better color saturation. The Arcam's audio was more refined. However, Dave let me know that I need to give it some time. As time went on, the Pioneer got better and better. Eventually, after a week or two, the Pioneer matched the Arcam's video, and the audio became a little bit better detailed than the Arcam, and just as smooth. At that point, I was happy with the mods, since my goal was to get the Arcam's performance in a blu ray player (since Arcam was taking forever to get a blu ray player out at that time).
That upgrade was several years ago, and the Pioneer still works great. Of course, I've moved on now to an upgraded Marantz blu ray player. The only upgraded component that has broken down was an upgraded Onkyo PR-SC5508 processor (that I still use). After one year, the HDMI went out on it. This was a common problem, as I found out, for Onkyo processors. I called TUC, and Dave recommended I call an Onkyo authorized repair center (closest to me) and get it in for repair, since it was still under Warranty. I sent it in, but I was a bit nervous regarding what they would think about the upgrades that Dave had done. Onkyo replaced the hdmi board and sent it back to me - no questions asked. OK, I could not resist, why did they not say anything about the upgrade?? I called the repair center, and I asked specifically - "So you fixed this under Warranty, even though it's had some upgrades done to it - does that not void the Warranty?". They told me that if the problem was due to the upgrade, they would not have fixed it. However, even though Dave had put the blue stuff on the chips of the hdmi board, they replaced the board, because they knew if was not problem from what he had done to the board. Needless to say, this turned out better than I had expected.
Dave