Summary: If any one is reading this you probably don't want this case now. There is an updated 300 that has 3.0 USB ports and better SSD mounting options. I own three of these and the only reason I bought this is was to move an old rig into a new case. There is no real reason to buy this case for a new build.
Pros: Perfect price/performance case in it's day. plenty of fan options, and understated elegance.
Pros: Building a rig for a customer's automation system and needed a decent looking black case. Plenty of room for a standard ATX form factor MB. SSD mounting on the floor of the case is nice as well. Runs quiet on antec's fans. No complaints whatsoever.
Summary: I own two of these specific Antec 30300 5.25" to 3.5" adapters. They're the ONLY ones on the market with a pseudo "honeycomb" look to the front which matches the honeycombing of the metal grating on my NZXT Phantom full tower case--so naturally it's what I'd buy. Overall it's a great deal. Be careful not to cut yourself when you pop the front metal plate off of the aluminum drive bay insert. Also--be ready to guess-and-check the inner 3.5" device's position...a lot...
Pros: Fits any 3.5" bay device, exactly as said
Cons: Have to use a screw driver to pop out the front panel, black face assembly does not attach to the metal bay insert itself so you have to guess-and-check where you're positioning the 3.5" bay peripheral you're installing a few times to get it right.
Summary: After about 2 and a half years the headphone jack on the front would only play through the right side. After checking on the Antec site from time to time for six months, the replacement I/O panel was never in stock. I finally decided to file a ticket to ask if they were going to restock it or offer the one from the new version for sale.
Pros: Tasteful aesthetics, lots of airflow with the 4 included fans, plenty of room inside for lots of drives and full size graphics cards. It is also very durable, I have owned this case since 2011 and it has held up very well, much more so than the similarly priced Cooler Master case I had before this one that looks like a post apocalyptic movie prop nowadays. Antec also has top notch customer service!
Cons: No cut outs for cable management and full size graphics cards will block a HDD slot. Both of these problems have been addressed in the new Three Hundred Two case though. The only other con would be that this and even the new version of the case still has the older style silver interior instead of the more common black nowadays.
Summary: My original case completely burned out the USB3 ports and headphone ports in the front so this was a replacement for a different case. Everything went into the new case without any problems and there was plenty of room for the motherboard and large video card. Cable management was acceptable given the cost of the case. I put a couple of blue LED fans in the front and it looks very nice.
Pros: Simple case plenty of room. Not a tool-less case but doesn't really matter to me. I just finished putting three computers together using three of these cases. I like the PSU at the bottom of the tower.
Cons: I only had one issue with one of the cases the reset and power switch are reversed on the front panel. So I had to change it so that the wire labeled reset is on the power switch connector on the mother board and the wire labeled power switch is on the reset pins on the mother board. I still gave the cases 5 stars because they performed as expected and I feel like I got my money worth on them.