They aren't really wrong i think. The mixed reviews i read (on fitfreak forum etc) were about:
pros:
- re-usable and therefore more environmentally friendly and cheaper.
- better perfomance
- better MPG (only mentioned by a few)
cons:
- cleaning, drying and re-charging with oil is more time consuming than old filter out and new one in. Also some were talking about oil coming on the MAF sensor (whatever that is). And because of the fabric of the K&N filters there 's more airflow, but also more particulate matter into the engine.
It's just a few things i found on the web, so don't shoot the messenger when they are not right.

Better performance? I am not seeking more (faster) speed. The Jazz' performance is good for what we need and use the car for. And after almost a year driving the iShift i know how to handle her without other drivers thinking: "Of course... there's a woman in a s-l-o-w Jazz. OMG!"
Better MPG is always good of course, but i expect more from my right foot than from the K&N filter for that. The re-usable thing is the only reason i would go for a K&N air filter.
Which alternative brands (paper filter) are also good quality as i have seen almost €30 for a Honda one? And i want it changed once a year (10.000 km) or is that too soon?
Maybe you can also tell me more about what's true about the cons (oil on that sensor and the less filtering than a paper one.) Also how about the recharging with oil thing, how difficult is this? @VicW i like to keep the Jazz to its last breath, hahaha, but not because i have damaged the engine some way with a K&N filter.
