I’ve spend a decent amount on EcoFlow units (Delta 2) that I use as online UPS for my servers and networking. They work great and I also recently installed dual 220watt EcoFlow solar panels on my roof that pump in solar during the day. Works nicely though the ROI admittedly is not there at all, just a cool thing.
> just a cool thing
I think that says it all. It's gone beyond practicality for me, and I'm OK with that. I'm also satisfied with the current setup; I don't need to spend more.
I have a couple of Ecoflow's and Bluetti, and a Segway LFP battery. They all work fine so far.