It works very well - I have the 1.25-2" QuickRack single and switch it between two vehicles, one with a 1.25" receiver and the other with a 2" receiver. I use an AddOn for the times I carry two bicycles. My wife has the 2" SuperDuty Single for her car and thus I have experience with both and can report they're equally solid.

Sure, if someone is buying a hitch and the vehicle can accommodate a 2" receiver that'd be the way to go, but in OP's case of already having a 1.25" hitch installed the 1.25"-2" QuickRack Single is a fine choice. Just be aware it's rated to 50# per spot (up to three bike spots with AddOn's) in case thinking about ebikes.