Shadow spec

I main spec holy because it is meta and i really do enjoy it. But, i wanted to try shadow for solo content and to just get to ocasionally go as dmg in keys . Anyway, i went with the preffered necro covent ( wow head) and let here rip.
I wanted to ask some of the other priest if they can honestly say this spec is worthwhile ? It seems between the covenant abilities and core ablites you have so much do before you can even consider having fun or doing decent dmg. I also run kyrian as Holy and having to swap covenants between specs all the time tends to he pain as well … what are you guys doing?