I love the action paks! We got a new dishwasher a year ago, and the place you put the powder is very weird - so when you put the powder in, it overflows no matter what and then you have to clean around the edges to get the detergent holder to close. I know this doesn't sound like it's a big problem, but to have to do it every time was a big pain!
With the action pak, I can just drop it in the holder, close it (perfect fit) and it's ready to go.
Only once, in the last 350 pacs (yeah, we get them at a warehouse store) has one failed. Looked good going in, BUT never disolved for some reason, came out looking like a rat had nibbled on the edges.
To this day, a month later, I have the failed pac sealed in a baggie to prove it. The thing has never ever melted more and has stayed totally intact.
Overall, I love the Cascade ActionPacs though!