Welcome from (slightly more chilly) SE Wisconsin! I'm still commuting on my electric fat tire bike with snow on the roads and sidewalks.
REI is a stand-up company, as you probably know. I would check their warranty and maybe talk to someone there onsite about it.
I've never heard of CO-OP Bikes. Doesn't meant they're bad, they could be a quality OEM for REI. (REI doesn't tend to use sketchy OEMs)
The bike itself looks like a typical urban commuter/utility bike; similar to my Aventon Level.2. I'm a roadie myself, but outside of club rides, , the Level.2 is the more rational choice. I get to work not sweaty in the summertime, and the rack & fenders are always handy.
You might also check your local Trek shop, they carry REID bikes out of Australia, which are quality bikes for a bit less money than Trek.
Enjoy your stay!