I hate most of the Cokin filters, being too oriented towards special effects or too inconsistent and uncoated for proper artistic use.
I do, on the other hand, like their filter holders to put other higher-quality filters in. I was wondering why I was having problems finding filters lately and I guess this explains why.
I think we're nearing the point at which I start to actively think about buying something like this to replace my now-ancient G7 instead of figuring that if my G7 actually dies, that's what I'd get.