Judging from the specs on the linked site, they are about as reliable as those $35 DVD players you can get at Wal-Mart. Which, surprisingly are very reliable for external DVD players. I have one, and have had no problems with it directly. So, yeah, if the specs are the same, which they appear to be, I don't see why they wouldn't be just as reliable.
Isn't there another website where one can order japanese CDs/DVDs? I remember a link when the other TDR DVDs came out a few months back, but can't find it. If I remember, it seemed a little more English friendly. I think I'm going to have to bite the bullet and import these.
edit: Nevermind...found the site....the prices are way higher, and the box set is listed as "out of print"
Of course, if anyone is going to Japan and wants to pick up these or those magazine style guidebooks, I'll make it worth your while
Get those $50 Philips DVD Players they sell at WalMart or Best Buy. In addition to being region-free DVD players (at least after entering a simple 4 digit service menu code... which will then make the player region free permenently) they play DIVX files... which (for those of you who don't know) is a DVD-quality compressed file format (much like the MP3 was for music, DIVX is for video.) For instance, you can fit an entire season of the Simpsons.... in DVD quality.... on a single layer DVD! That's 22 episodes! 8)
Anyhow, they also play MPGs, AVIs, MPEG2s, MP3s and a list way too long to print here. But the DIVX support really is something, and at $50, you really can't beat the price!!! If you have $81, you can buy a Philips model that adds 'upconversion' to 1080i resolution over an HDMI port, an improved/faster DIVX decoder, and even a USB port. Can't believe how cheap these toys are getting!