I have not seen one in person but the YouTube videos I've watched indicated that it's a strong competitor in the EV market. Kia is doing a really good job with their EV line.
I saw a red Mach-E yesterday and thought it looked great! Much better in person than in videos.
Both Ford and Kia have somewhat more conventional interior designs (more physical controls) than Tesla which is exactly what a lot EV buyers are going to want.
Out of Spec Reviews just posted a video on their 70-mph range test on a 2022 Kia EV6 AWD. Kyle is enthusiastic about the car and he's driven just about every EV out there.
I think I've talked about this several times in this thread, so, excuse me if I'm repeating myself.
The 10-30 (240v 30A) UMC adapter costs $45 from Tesla. Charge rate on a Model 3 is about 22mph at a charging current of 24A (80% of 30A). That is a little less than the UMC's maximum charge current of 32A on a 40A, or greater, circuit. That charges my Model 3 at about 34mph.
The Tesla Wall Connector can charge at up to 48A on a 60A circuit (supported on all current Teslas except the Model 3 RWD/SR+ which maxes out at 32A). You'd likely need new wiring to upgrade your 10-30 receptacle to a 60A circuit unless they over-gauged the wires.
In my view, the benefits of the Wall Connectors are that it looks really nice, can handle the load-sharing when multiple Wall Connectors are installed on a single circuit, and seem to be the better choice when the charging station is being mounted outdoors as you don't have and outlet to protect from the elements and aren't leaving your UMC outdoors. The somewhat faster charging is unlikely to make any difference to most drivers.
I initially considered ordering a second UMC (~$320) so that one could stay on my garage wall while the other stayed in the car. That's unnecessary, IMO. I'll throw it in my truck for road trips, though I likely won't need it, but you certainly don't need to carry it with you on your daily driving.
I don't know if you're still in a situation where you can return the Wall Connector, or resell it for a significant percentage of it's original price, but I think you'd be just fine using the UMC with your 10-30 receptacle and keeping nearly $500 in your back pocket.