Mark, I've just installed a Kings 200Ah lithium to replace my Giant 170Ah. Also had hesitations with Kings gear but 200Ah for $549 couldn't be ignored. I sold the Giant for $300 so not a big outlay to do the swap.
It has 200 amp max continuous draw which works well with my induction plate and air fryer. The Giant was 150 amp max draw. I use a Junctek 500 amp shunt battery monitor with bluetooth & wifi connection, even WLAN.
I did a quick test with my 2000w heat gun at full output and it pulled 184 amps at 12.4v through my Renogy 2000w inverter.
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