Having purchased these two cases, I'll point out the strength and weakness of these cases.
VoomPC-2:
1. Not enough space for power connector on SATA hard drive with D201GLY2A or D945GCLF motherboards, forced to use IDE hard drive.
2. Too cheap to include extra wire for connector, you have to order these separately.
3. M2-ATX power supply fits perfectly.
4. The CPU or chipset fans on the D201GLY2A/D945GCLF only have about 1mm clearance from hitting the top of the case, this certainly won't allow good airflow. No clearance for my PCI serial card.
5. Super noisy fans (40mmx40mmx20mm, 8000rpm, 10.28CFM, 32.92dBa), had to replace both with 14dBa 40mm fans instead.
6. Super heavy, a car could run over it and probably have no damage, very strong.
7. Fit and finish good overall, but couldn't get my CDROM/hard drive caddy to fit, had to grind that sucker down before it would go in.
8. Found my power supply wires getting chewed up from the sharp edges inside the case, had to use tape on the sharp edges. Assembling the case together is difficult because it's too compact.
9. Comes with a built in LED that lights up VoomPC, can be used to notify if your motherboard is powered up, or power supply led indicator, or whatever.
10. Provides support for CDROM drive in an already tight case.
11. The connector on the case can be pushed in easily, but with care you can connect it. I wish they made the hole smaller.
Mo-Co-So:
1. No clearance problems for SATA/IDE hard drives.
2. All wires present, and includes extra long wire for powering up monitor.
3. Had to drill two holes for M2-ATX power supply, fortunately aluminum is easy to drill and tap.
4. A good centimeter or more clearance on top, providing good airflow. Also provides clearance for my PCI serial card.
5. Noise is moderate, not quiet or loud. Only 1 fan, 50mmx50mmx10mm, 6000rpms, 6+ CFM.
6. Light weight, and strong enough (a car running over it would certainly flatten it into pancake though... lol)
Edit: I'm wrong, apparently it does survive a car running over it. See this link
7. Fit and finish okay, I find the screw holes outside on the case a little too close to the edges, a little concerned about it snapping.
8. Plenty of room for power supply wires, no concern for wire getting chewed up. Assembling/disassembly is easy.
9. No LED.
10. No support for CDROM drive. Go with an external USB CDROM drive instead.
11. The connector can be pushed in easily, and there was no way to connect unless you shove some object in between the connector to prevent it from collapsing. Again the hole should have been made smaller.
Overall I like the look of the VoomPC-2 case better, but the Mo-Co-So case is more practical which is the one I'm keeping.