Summary: I was trying to build a small HTPC and discovered that I couldn't get Linux Mint 16 to work without freezing with my motherboard/CPU combination (Windows was fine, but we prefer LM for security). I finally decided to abandon my compact iStarUSA case to try a case supporting a discrete graphics card. The Antec case was the smallest reasonably-priced case I could find that supports a half-height graphics card.
Summary: I had specific size considerations in mind for building my newest PC: it had to fit on the countertop of my butler's pantry, so I was looking for a PC that was roughly the size of a shoebox. That made my search rather limited, and the ISK 300-150 was one of the very few that I considered. Given its diminutive size, Antec did a decent job with it, although there are some questionable points.
Summary: i think most people's complaints about mini itx is the fact its hard to reach and connect things with normal size hands. the frame of this case comes apart in every way so that you can easly connect each facet of the motherboard without using needle nose pliers or tweezers. the optical drive mount and the hard drive mounts both sit right on top of the mobo, which would making connecting all the fans and sata ports impossible, except you can unscrew and remove the optical...
Summary: a bit of a pain to get all the cables routed in this thing but that is already accepted when you are talking about a small form factor case like this. one thing to note if you are using this as an HTPC you will have to cut off a latch the install the cable card into the ceton tuner card, if youre using a USB card then dont worry about it.
Summary: Changed out the included 80mm fan to a Noctua because I heard the stock one was noisy. With that, system is very quiet using retail heatsink included with Pentium G2020. This was for a small build for an older family member that wanted something that would fit in a small workspace but also had an optical drive so this was a great case.
Pros: Fun system to build, small, quiet
Cons: Proprietary power supply but you should know that going in
Summary: Shipping was a bit slow. The case itself is OK for ITX sized builds. Instructions are very vauge, so you need to figure out how things work/go together. Space inside is VERY limited due to it's small size. I would recommend a second 80mm fan...the "quiet" type to keep thing cool. The biggest down to this case is the flimsy front slim DVD cover.....I didn't install a dvd drive in this build, but opened/closed the cover a couple of times....