Yeah, I sure would NOT rate Dell supplies as top-tier but I would definitely rate them higher than any no-name or off-brand generic.
And BTW, if you look
here in the CLEARResult database (the official keeper of the 80 PLUS certification program), I see no Fantech PSU listed at all. That would make me question whether or not that 80 PLUS Bronze logo is truly authorized to be there.
That said, it must be noted that 80 PLUS certification is NOT an indication of quality, reliability, or any compliance with the ATX Form Factor standard. It is ONLY an indication of a relatively "flat" efficiency curve across a wide range of load levels - certainly important - but nothing conclusive in terms of quality.