We use the EZ Flo Injection Model 1010-HB injector at different places on the farm.
It's relatively easy to move around and disconnect and connect so it's ideal if you only need a single injection system.
We don't move the 1010-HB around as much as some others might need to since we want to optimize our amendments. We can be flexible and fertilize one garden or area and then move to another area until we're ready to add liquid amendments again at the first area.
The optional Quick Connect kit makes the Model 1010-HB even more easy to move around and creates less stress when connected to a hose bib or hydrant.
We purchased our injector, the quick connect kit, and several extra O-rings from DripWorks.