Did a test run of the installed fans running & woo hoo no vibrations at all, 1 of the fans has a faint wobble but isn't causing any vibrations with them being solidly secured but it's all genuinely silent, I had to stick my head inside the case to be able to hear them running lol so it will definitely live up to it's stealth part of the name & the air flow goes as expected , just hope it can cope with the overclock I have on it, it's only just above a faint breeze going through the case so should be ok just about, people think those Fractal Design Define R3 cases are quiet, I've built a rig for my bro with 1 & they aren't so quiet but this is silent as if it's a passively cooled rig so if anything is going to make any noise on this it will be the gtx 580 really can't believe how silent it is, if there were no spinning fans or lights you couldn't tell it was on .
Also done a little smoke test so I could see the flow working correct & it does although the bottom front fan is cutting it fine, ideally it needs pulling 10mm further into the case so it flows that little bit better, either that or add a seperator piece between the 2 front fans.