Depends on the application. If it is a less demanding design, there should be no issues. At 1 dollar/filter it's a good deal.
@ Rick:
"FWIW Johnny, Mann-Hummel are one of the big three internationally in filtration (with Donaldson and Cummins-Fleetguard) in terms of sales and R&D in media.
They tend to concentrate on the OE market."
I'm Sorry, Mann is no longer "THE OE-filter" in Germany. Knecht-Mahle and Hengst are widely used too. The Mann replacement oil filter cartridges for "Hengst" filter housings happen to be a loosy mess. AGCO/Fendt released a letter warning against Mann cartridges for their Deutz engine powered tractors.
The letter might exist in English language as well, I can't find it though. This is the German version:
http://www.hansefilter.de/downloads/fendtmhnachbaufiltereinsatz.pdf
For HD-use, I would stay away from Mann. Personally, I happen to use Mann spin-on oil filters and air filters in the car or an old IH tractor that hasn't seen anything better before. With a simple cellulose spin-on filter for a car, one can't go totally wrong with Mann.
That said, for a well engineered North-American engine, like our CDCs, Fleetguard and Donaldson are the way to go. Baldwin and Wix might be an alternative, I've actually been looking at a BF1280 fuel filter.
Again, a buck a filter sounds good.