Buy it. I have two similar ones that are only 17A (but realistically only charge about 15 to 15.5A according to my shunt). I use one of them for when I get no sun for three days and my pack gets below about 50%. It seems to work fine, it has a green light that is steady on when in bulk charging and blinks when tapering off charge on top. I try not to let it top them off completely because I cant program the shut off point, but I have forgot to keep an eye on it and it stopped when it was supposed to.
Before I got these 17A ones I used a 15A (actually charged about 13A) that was for 48V lead acid golf cart batteries. That one only would charge to about 56V if I remember correctly. But since it was half the price of a LFP charger (and I got it on sale for even cheaper) and most of the power in LFP batteries is around 52V, I figured I would try it out. It also worked fine although I never let it complete its charge cycle. I would set a timer on my phone and check my voltage every 30 minutes until I got to about 54V and turn it off. This 54V is would equate to about 95% of my amp hour capacity.
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