Hi,
I have most of their sets and think they're great, one of the few plugins or actions that I've not regretted buying. There is if anything too many actions in that it takes a while to get used to which one is suitable for which image but they are very effective and easy to use. One big plus for me is that they allow you to very easily adjust the strength of the effect and unlike some they don't change your original or background layer.
I'm planning to get their texture actions (or even the DVD upgrade) come pay day to complete the set.
I've used the portrait kit and volume 1 the most but there are some good hidden gems in the other sets as well.
Support is also first class and John has always been quick to help with any queries I've had. There was a good review in PSD magazine a few months back (I think you can download it from the 1-click site) and I've noticed there's a Flickr group just started at http://www.flickr.com/groups/1clickactions - last time I looked there wasn't much in it but it might show a few more examples.
CJ Dennis