One unit we're looking at is from Blue Sky Avionics, the M12 Cricket
http://www.blueskyavionics.com/M12_Cricket_HG.htm
...Does anyone have experience with these? Do they make sense to use?

Good choice. We have made a "Cricket" available to renters of our
2-33s sans electrics, since BSA was Ball Varios here in Boulder, CO.
They enjoy it.