The inside of the case is very spacious, how else can you fit 5 5.25" bays, 6 internal 3.5" bays, 1 external 3.5" bay?
Here is a shot of the drive cages, notice right before it there is a huge square hole. I like this design of the Inwin due to the fact that having a larger hole there helps in moving hot air. Once you get your system in there, the cables will be all over the place and you definitely don't want it cluttered in the middle.
The fans used are 3DCool labeled, which are really Sunon fans. The fans have pass through molex connectors so you won't be sacrificing any connectors for the fans.
They also have their own privately labeled power supply. The sample we received came with a 300W unit, large enough to power just about anything. The case does not come with a power supply, but you can add in 250-460W. Price depends on your preference.
You get the power cable and a little bag of screws and expansion bay covers. The case uses brass nipples for your motherboard.
The tray is pretty easy to use, I'm getting into the habit of demanding that for every case that passes through here. But do keep in mind, we did our test again on the having large heatsinks. We slapped our Globalwin SAK38 on our IWill and it didn't make it through. The opening from the tray to the edge of the case is about 85mm. Anything over that and you'll have a small traffic jam there.