Knightro, This are my impressions(not the absolute) to the questions that you've posted;
1) There is a strong possibility that they are durable, that is, if I'll base it on the ownership of the people who have reportedly owned for more than a year and has been giving posts praising the ApexAd600A(clone) and the MALATA(rebranded).
Most of the complaints, that I've encountered centered only on the Karaoke capabilities of the APEX & MALATA. There has been no reports of units suddenly dying out or plainly going haywire.
Now, as you can see, most of us here have only recently acquired the Konzert, hence, It'll probably take sometime, before we can really give you our word and confirm to you the durability of our unit, However, if I remember right, I stated once that since this is a China made unit,hence we should always expect some lemons
(but isn't it true that US,Euro, and Nippon made ones are not exempt).
In fact, I believe a member reported that his unit was malfunctioning, thus was reported to the store and was immediately returned.
He was lucky ;Denough to be given a new unit, his last post indicated that he will keep us updated on his acquisition, however, till now, there has been no update.
By the way, I think all the optics are sensitive to EXTREME Temperature changes. I've encountered this changes even w/ my LD,VCD,CD, and 2 DVDs, I think, what should concern you is the capability of the unit to immediately revert back to it's regular function. I believe the Konzert fared better in this aspect, if I am to compare it to my Nippon Made Panasonic.
2. The Audio output is much the same as my Panasonic A300 DD converter capability(actually the sound produced will ultimately be dependent upon your Amplifier, what I deemed as comparable is the converting quality w/c can be judged by the way it's 2 channel output will be percieved, the way to test this is to hook your unit via RCA out to a Pro Logic amplifier, now satisfaction is dependent upon your taste)
The DTS is a Pass Thru, meaning, that you should have a DTS capable Amp, that will either decode the info via the Optics or a co-axial.
Now this is only a pass thru, and my main complaint here is that you'll have to program
the Konzert(unlike my Apex &Panasonic) to RAW in order for the DTS to pass thru. All my CD's play well.
In fact, in one of my posts, I reported a CD burned thru the obsolete Adaptec 4, That was rejected even by my ever reliable CD players, and the Konzert just played it flawlessly.
3. Now, the 96/24 DVD audio, I don't know, maybe FIREWIRED can help.
It's not the ULTIMATE one Man, has it's faults as reported but I assure you, as long as you get to avoid the lemons, this unit can put a smile in your face.
In fact, I'm still smiling as I typed this piece.