They're fine, so far, but then it's a pretty idle system. Not a lot of use output wise. I check on it whenever I'm in the store/work room. Always at 100% unless I just ran the belt sander. I think Renogy is targeted towards the RV/Boat/Trailer market, for what that's worth.
With prices down, I do toy with replacing the gel cells with LiFiPo, but I'll probably wait until I need to replace them. Or I come up with some other project. I did buy a Jackery 300W all-in-one unit that I can use portable. Take it out for tailgate events to run electronics. Would run them off the truck inverter but it requires the truck engine be running. I may add another slightly more powerful unit as their prices are way down as well.