I've had a Dillon 550 since 1980. Other than the fact that their powder measures life seems to be 10 years, I'm on the third one now, have had essentially zero problems.
As for the Hornady press mentioned, I have seen pictures of it only, however should the frame of a Dillon fail, not a likely event I would thiunk, they will repair or replace, which seems answer enough with respect to frame longevity.
As for dies, mentioned by someone, any 7/8 x 14 dies work, and exchanging tool heads seems simple enough for anyone to manage. Even I can do it.