can I ask what you bought and how they failed you?
Multifuel stoves and lantern. Both leaked like crazy from new, the stove had a bad weld on the tank, the lantern leaked in multiple places. I replaced the tank on the stove at first, but the system still kept going out and not working properly.
Coleman offered to send me completely new pieces, I declined, returned the garbage and switched brands, no issues since …
I wanted to stay with white gas, to keep it to one fuel system, but their products are just cheap as hell, zero quality control. My MSR and Primus stuff isn’t as practical, since it’s backpacking gear, but it “just works”, in case of my MSR stove for decades now. Haven’t found another multifuel lantern yet, but using LED has been okay.
I've since caved in and I'm in the process of switching my main rig to propane, partly because of a off-road trailer with propane system. Not something I'd want to use on international trips, but for North America it'll work fine.