I just brought a BeQuiet! Dark Power Pro 10 1200w to replace a Corsair AX1200i which I'd had a lot of trouble with.
First thoughts are that it's absolutely outstanding in terms of noise level, as I'd hoped for, since this is obviously a big focus for Be Quiet! in all their products. Mine is super quiet at all power outputs up to nearly 1kw (full load on my system) with the fan noise at idle-loads being inaudible, and at 1kw being still so quiet as to be barely noticable even with your head right near the case specifically listening for it, and this is with barely any other fan noise to mask it (my system is water cooled). It also has absolutely no coil whine (the AX1200i had quite a bit, so it's a big relief to be finally rid of the noise).
The package is very nice - good cables and plenty of them, the main PSU unit itself feels very nicely built and solid, and is attractively finished. There is a comprehensive manual, plenty of velcro cable management straps, some cable ties and some really nice big knurled thumbscrews for fitting the PSU to the case. There are also some fan leads, as the PSU can directly control fans using an inbuilt temperature sensor, unfortunately these are not braided which is a bit disappointing, but I don't have any intention to use them anyway as all my fans are already controlled from motherboard headers and an aquaero, however if anything could be improved it would be to braid these cables.
When it comes to DC output quality, I don't have the equipment to measure for myself, but going by a couple of in-depth reviews I found, it's up there with the very best PSUs on the market. The configuration is quad rail, with 2 x 35A rails powering the CPU, ATX and ancillary outputs, and 2 x 45A rails being split between 4 outputs to the GPUs, this is ideal for me - I absolutely didn't want a single rail PSU again after I had an AX1200 melt it's connectors and fill the room with smoke. OTOH, you can easily configure it as single rail, either using a supplied jumper, or a PCIe slot bracket with a switch on which lets you select between multi-rail or single-rail while it's installed (although not while the system is on).
At this early stage, and barring any upsets with reliability, I can highly recommend it.