So, I received my new promo case today. All that I have to say is WOW! 
I did a stress test without any breaking, The color is spot on. It nicely fits the bigger Pokemon manuals,the sleeve is tighter than the first one, and since the logo is now printed instead of cut out it seems a lot stronger!
I honestly see no problems with this batch. I'm so ready to get these in!
I also received a sample today (very quick shipping by the way!). I didn't have one of the previous batch to compare it with, but I can confirm that this is a very very impressive case. I've tried DS cases, off-brand gray DS cases, clear EU DS cases, 3DS cases and off-brand 3DS cases, and these are extremely high quality - pretty much up there with the official DS cases.
Let's start with the basics. Build quality is excellent, and I encountered no breaking, cracking or warping whatsoever. The sleeve feels strong and well attached, like the official DS cases. The logo on the inside is nice and doesn't detract from the look or build quality.
The color is pretty much spot on to official DS cases. You can see Shadowfox's case between Diddy Kong Racing and Phantom Hourglass, which are both in original cases. It lines up perfectly!
The clips for the manuals are tight enough to hold some of my thinnest manuals (like Sonic the Hedgehog Genesis), but flexible enough to hold thicker ones as well. And there is room for the larger manuals like Pokemon Red/Blue Trainer's Guides, which fits perfectly.
Of course Game Boy, Game Boy Color and Game Boy Advance games fit perfectly. They are also pretty easy to get out, but are held in securely.
Kirby Tilt N Tumble fits just as well, as does the DS Rumble Pak and one of my bootleg Sonic carts.
Even the the GBA Wireless Receiver manages to fit, and closes with only a small bulge.
Drill Dozer does not fit, however I believe it will be a simple matter of clipping off the upper support clips and it will fit just fine.
GBC Rumble carts obviously are too thick for a single case, but what surprised me is that you can slide them in from the top and they stay in very securely. Makes making double cases that much easier! Similarly, I believe WarioWare Twisted will stay in place with minor modifications to the bottom part of the potential double case. Unless of course Shadowfox can someday afford to make a double-thick variant for the GBC rumble games, WarioWare Twisted and peripherals like the GBC, GBA, and GBA SP GameSharks and DS Paddle Controller.
And now the million dollar question....
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Wisdom Tree games fit!
While I don't have these cartridges, I suspect Robopon Sun Version, the Boktai games, the Nintendo MP3 Player and Play-Yan will all fit nicely with only minor modifications. We also already know Yoshi Topsy Turvy/Universal Gravitation fits unmodified.
Overall, I'm not just impressed but blown away by the quality and versatility of these cases! Outstanding work Shadowfox!
