The difference between a $20 PSU and a $60 PSU can be huge. It's always worth looking, as there are definite bargains to be had on quality units that are just re-branded.
Like the Rosewill Capstone series, which everyone would assume are garbage being as it's Neweggs house brand, are actually re-branded Superflowers. Got my 550w 80Gold modular one on sale for $60 back in 2013 and it's still going strong.
The P2 you just bought is also a Superflower unit.