I didn't run into any issues during installation in my SilverStone FT01 midtower case. The modular cable system was a real pleasure to work with, as my previous power supply isn't modular, which created a pretty big bundle of unused cables that sat right in front of the front intake fan. I also liked the all black design, as it fit very well with the rest of my system color scheme.
Below is a complete list of the test system specs.
Intel Core 2 Duo E7200
Cooler Master V8 Heatsink
2GB A-DATA DDR2
Palit HD 4870 Sonic Dual Edition
Western Digital 74 GB Raptor 10,000 RPM SATA
Western Digital 120 GB 7,200 RPM
Samsung 160 GB 7,200 RPM
Creative X-Fi Sound Card
SilverStone FT01 Case
2x 180mm Case Fans
1x 120mm Case Fan
Logitech MX Revolution
Logitech G51 Surround Sound Speakers
I used a digital multimeter to obtain voltage readings. Since most power supplies correct any fluctuation in the current to the rails before our multimeters would even notice, we're unable to monitor every output in real-time simultaneously. To record idle voltages, I let the system sit idle in Windows for 20 minutes. For load voltages, I ran Prime 95 (one instance per core), OCCT, ATITool 3D View Fuzzy Cube, AIM, Outlook Express and a few Firefox instances. This combination of programs put a nice load on the system. Below are some photos and the results from my testing.
Testing shows that the BFG Tech MX 680w had zero fluctuation on the 3.3v and 5v rails. The 12v Molex rail only budged by .01v, while the biggest fluctuation was on the PCI-E cable which saw a fluctuation of .10v, which is still within a very acceptable range. Also worthy to note is the fact that all rails were spot on with where they should be, meaning for example, the 12v rail wasn't unusually high, which we have seen on other power supplies in the past.
The unit itself looks really nice and is black in color but neither flat nor glossy - kind of a happy medium between the two. All of the cables, both modular and fixed, are sleeved in black mesh, including each segment of wire. The 120mm cooling fan was very quiet during use and was never audible over the other fans in my system. The 80mm "helper fan" never turned on that I am aware of. Each time I checked it, it was off. The rear of the unit is clean and uses a free-flowing honeycomb style grill for maximum airflow.
Velcro straps and zip ties are also included with the retail package, although with the modular cable system, I didn't need to use any of these but they are a nice touch.
BFG Tech offers a five year warranty on this PSU, but note that you must register the product with them within 30 days of purchase to activate the warranty.
As of writing, the BFG Technologies MX 680w Modular Power Supply retails for $134.99 at a popular online retailer, which puts it in the middle of the pack for this power range.
If you are looking for a nice midrange modular power supply with fully sleeved cables and exceptional cooling, the MX 680w is certainly worth a look.