PC Mech posted a review on the Ultra X-Connect 550 Watt Modular PSU

Of the major components in your computer, there is one piece that people tend to turn a blind eye towards, not thinking about the vitality of its operation and durability. The power supply is easily the most important piece of equipment in your computer, and also one of the relatively cheaper parts. When people who are new to computers organize their first build, they tend to think that any power supply will do just fine -- a power supply is a power supply. They buy the ones with the most wattage, because the bigger the number, the better it is, right?

Ultra X-Connect 550 Watt Modular PSU Review