I love the principle of the mini elitedesks, but some have a terribly annoying fan. It's not firmly attached to the chassis, so it rattles while spinning (and it spins all the time). The heatsink uses a proprietary 3 point attachment, so you can't use a big aftermarket cooler instead (even though it wouldn't fit in the case, I would have accepted the compromise).

Not sure about the <=G3 and >=G7, but the G4 and G5 have the issue. The G6 seems to have the fan attached more firmly, but I've never tested one in a quiet room.