Not sure a root feeder is needed, but 'enjoying wiserwand for spot watering

There was an article on gardenmyths.com about root feeders not being advantageous over a surface soak.
However, I wanted a tool to replace the Ross feeder that I had, since it was leaking profusely, perhaps a slight crack in the plastic.
So far I'm enjoying the Wiserwand. Here's a link:

https://www.youtube.com/watch?v=-VIJ3q1Coxk

https://wiserwatering.com/

It provides good control of surface watering as well as getting under the mulch. The foot pegs prevent the probe from going deeper than about eight inches.

Have you used it with a pump sprayer? How did it do?

Sorry not to have replied sooner. I've been picking from my four tart cherry trees. I haven't tried a backpack sprayer. The less expensive ones, like the one in the wiserwand video (not sure that one is still being sold) didn't get good reviews for durability. I did see a Milwaukee one in an ad with a motor, electric I believe, and that was several hundred dollars. Also, the soil I'm dealing with is fairly hard clay and I'm not sure a backpack sprayer would have the same pressure as the garden hose. So, after considering this article:

https://www.gardenmyths.com/deep-root-fertilization-trees/

I'm using broadcast or drench methods of delivering plant nutrition.