Positives:
++ Water is clear again, freed from dirt and especially bitter tasting lime.
++ Connectors are provided with teflon tape
Negatives:
- Is less than an original cartridge and accordingly contains less carbon.
+ - Should the course be smaller amount than in the original cartridges of high-quality perspective, the whole back.
All in all I give it 5 stars because the water taste after trouble-free installation is now excellent.
SUPPLEMENTARY 06.02.2012:
So slow is the first cartridge on the mind.
RESPECT ... long life!
5 stars + from me!