The Pocket Rocket has been my main stove ever since it came out, and I have been very happy with it, but"tightness or looseness of a few moving pieces" could be critical to its proper and safe operation. You do have to be sure that the stove is completely shut down, and not leaking; even with the original PR this is something you have to pay attention to, and it can be a bit tricky.

I always detach the stove from the canister when I am finished in order to prevent inadvertent leaks. I have never had a problem with the canisters leaking with the stove removed, although I have heard of such a thing happening - makes it hard to brew that nice cup of tea the next morning.

Other than possible leaks from improperly closed valves, I don't think there is very much that can go wrong with the stove; it is basically just a burner head.