For camping I use a perculator, try to slip in a filter to ease the cleanup. I've used and like the filter press cups, but they are messy to cleanup but simple.
For kits I've used coffee bags from Folgers ...but will have to quiz my friends in Oz about the Timms products, they sound nice.
For E-kits, my choices revolve around cleanup ... and loose grounds is a pain in my mind...though it makes better coffee.
Am intriqued by the java juice extract product. Will be gettin' some of that and trying it out.
Small, compact and easily cleaned up is high on my list for E-kit use and packing light and so higher cost for less used isn't really a problem either. Car camping, with space and weight being a non-issue, mostly, I can use the same stuff as at home and manage the invested cost easily.