Howdy,  Until my mother in law had to leave the ranch  ( age related health issues), I cut a lot of "cedar"  The ranch was in Cherry Co. NE, and as near as I can tell the Cedar there is a mix of ERC, Rocky Mtn Juniper and hybrids.  The bottom line is that I think it's great stuff.   The trees I was cutting provided much denser wood than store bought ERC lumber.  Getting a truly straight-grained stave was possible and the wood is easy to work.   I made ELB style self bows, sinew backed bows and one hickory backed bow.  
If you can find some straight-grained wood, I would definitely set it aside for bow making.   Juniper has a reputation for blowing-up from tension failures so you need to make sure you have a pristine back &/ or back the stave.    
Ron