Well...I like mine a lot, and it's unmodded. As you know, the thing is a beast - as well built as you could hope a disc player to be. At the time I got it, I was so impressed with its sound that I sold my DAC - I was really into SACD at the time, and the DAC of course was useless for that. I was also very into multi-channel at the time, and had high hopes that multi-channel SACD sound come to dominate the audio landscape.
But of course, it didn't, and a couple years later I started digitizing my CDs (lossless of course), and as SACD releases slowed drastically and 180-gram Vinyl started to increase dramatically, I drifted back to Vinyl as my main hi-fi source, so my DVD-5900 goes largely unused, except for movies.
I have had people try to attack me for using "only" a universal player as my digital source, but never anyone who has actually OWNED a 5900. It sounds much better than many Denon players which came after it, and was Stereophile Class A for years. It's as good an SACD player as most people could ever need. There is certainly better for CD playback, but only in the $2K+ range.
As always, JMO.