Here's the sub forum for electronics that includes numerous posts on speaker installs. Do also consider purchasing from Crutchfield, as their prices are competitive and they give you all of the Maverick-specific installation notes that you will need.
That's what I did. Both searched the sub and...
You asked if they are a real company. They are a real company, so I responded in the affirmative.
If you are sending multiple contact attempts and there's no reply, then there's an issue that is easily rectified with a charge back for failure to deliver.
Anything else?
Same. Found it in another state.
The worst of the problems were with the dealer. Nothing else not documented as SOP. A bit over a year of ownership and nearly 11k miles. Just did a round trip an hour each way and got 49.7mpg. Mostly 45-55mph. Hard not to love that.