Hardware Secrets posted a review on the BFG LS-550 (New) Power Supply

LS and MX are sister power supply series from BFG, with models from MX series coming with a modular cabling system, a 120-mm fan and an auxiliary 80-mm fan on the rear, while models from LS series use a 135-mm fan and no modular cabling system or second fan. Initially both series used the same internal design, however this is not entirely true anymore. All models from MX series are manufactured by Fore Point (one of the factories from Fortrex), but LS-450 and the new version of LS-550 (marked as "LS-550 (New)" on their website, being the model we are reviewing today and currently available on Newegg.com) are manufactured by Enhance. The old LS-550 and LS-680 are manufactured by Fore Point with the same design as models from MX series. According to BFG they will move all models from MX and LS to Enhance in the future, and when this happens units will be either released with new wattages (e.g. LS-700 instead of LS-680) or will have the name "New" added to their name.

BFG LS-550 (New) Power Supply Review