I enquired about the Vyair pump myself as I fancied an experiment with something other than Shurflo but they're not in stock until early April despite what the webpage says.
I was looking for a spare replacement pump as both my Shurflos are over 5 years old. I looked at Vyair and sent an email asking for confirmation that the 5lpm pump only draws 3amps as advertised. Got an email back confirming when stock would be available, but no confirmation of amp draw was forth coming. To me it seemed as though it was 'overlooked'. (I asked the question twice on 2 different emails.) If it was 8amp like the 10 & 12lpm pumps are, then it would draw more current than the Shurflo.
Give them credit though, I got a speedy reply to my enquiry on a Sunday evening - the same night and in my books that's an excellent response.
But I would go with what I knew. which I will do.