Mostly the tempered glass. At that price point you could also expect more external bays, but again, we didn't say "not good enough" -- just "not old-school enough."I don't understand why the Thermaltake Core X71 was considered "not old school enough". For my new rig I've built this year, I got a Thermaltake Core X31 (more compact, mid tower version of the X71) and it has all "old school" power user features one might want (I think the only thing it's missing is an external 3.5-inch bay, but it has 2 external 5.25 bays). It's a great case that I can strongly recommend. My only nitpicks on the X31 are: 1. the USB and audio ports positioned on the top of the case without any sort of dust covering; 2. the fans are only 3-pin and fairly noisy.