I have SRAM Rival on my road bike and have no problems with it. I have no experience with Apex, don't know where it fits on the quality continuum for SRAM.
I have had experience with Shimano Tiagra and Ultegra RDs. The Tiagra needed frequent adjustments. The Ultegra was great, never caused any problems.
If I were you I would try to find a new LBS. I am not treated that way by anyone at my LBS. If I were, I would call the owner and tell him, because that is not the standard of service that he expects from the people he employs.
p.s. One thing I have noticed with my current bike -- my handlebar bag sometimes hits the barrel adjusters for the derailleurs, and this can lead to shifting problems and require more frequent adjustments. When I am careful to make sure the bag stays clear of the adjusters, I have fewer problems.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles