I've looked into some models I can purchase, but haven't played with them. I like the rams because they are so low tech even a stupid like me can handle them, and the energy supply is direct. The one I've set up the other day (dumped into the river and tied to a stick) is still pumping.
I also love solar thermal, for the same reason. To me it just seems to make more sense to develop tech that doesn't transfer energy from one form into another a million times, because that is something pitifully underdeveloped in our electrical monoculture. That's why I keep building and advertising the rams.
For my daily life micro hydro power would be a useful addition, really want to get into that when I have time.