For clarity, that camera doesn't offer interchangeable backs, just interchangeable inserts, so you cannot switch film mid-roll. The problem with the prism is apparently common to that generation. These are/were excellent cameras, but they are getting old.
Personally, I prefer the more modern bodies that offer interchangeable backs.
The 150mm f/4 lens is a good lens. The more recent 150mm f/3.5 lens is better.
It looks like the 45mm lens is the older, larger version that requires 77mm filters. The more recent 45mm N lens that requires 67mm filters is a bit better, and definitely more convenient.
It is a good kit, but I would buy something more recent.