Advise for gravel bike

Hello everyone.  New to this form.  Long time road biker, 3 third year riding Gravel and ready for new bike.   Looking at the 2020 Niner RTL RDO, built with Shimano GRX Di2 with 2X and Enve G23 wheels. Was thinking about just buying the bike complete, until reading a post here and "SWGraveler" talks about the Enve G23 Wheels.   Since Niner does not offer Shimano GRX Di2 build this adds another reason for frame build.   Another option Sala Warbird or Cutthroat with similar build.   Or just buy a complete bike and upgrade wheels later.
          
Has anyone purchased a bike from Wrench Science?   Or should I find a local shop for the build?  

Thanks