Creampuff is talking a lot of sense on this thread. So long as flying is an outdoors activity these instruments really should just be confirming what you already know. I dont see why (for vfr at least) they cant be on condition items.
If your situational awareness is so suspect that you cant detect gross errors in a mag compass you really need to question your proficiency.
PS. Sorry about the nylocks Hasher, Dynon supplies em as standard!