I just purchased, received, and started to use an electric pump that keeps the pressure at a pre-defined level. Once it drops a bit, it automatically re-pumps to the pre-defined level.
I’ve used it only like 3 times, but it is so much better than having to manually re-pump every 30 seconds to maintain pressure.
Negatives are that the pressure is defined in a weird measurement I’m not familiar with, but that’s not too big of a deal once you get a feel for it. Also, it only has 4 different levels of pre-defined pressure and you can’t set your own. So far, that hasn’t been an issue either tho. I’ve only used the lowest and second to lowest pre-defined levels.