Dosing pump opinions

[Phormium]

I’m finally sick of manual dosing. My negligence in keeping things stable, especially alkalinity, may have caused a bout of tissue necrosis in a couple of my Montiporas.
So I’m ready to start shopping on-line for a dosing pump, probably just 2 head, and thought I’d solicit opinions. There are some cheap ones out there like the “Marine Color” and the “Jecod” but some of those appear to have low build quality and reliability. I was looking mainly at the Eshopps as its build quality and reliability seem much higher, but there are lots of other brands and models available. I’d be dosing calcium and alkalinity supplements.
Any thoughts from dosing pump owners would be appreciated.