Can't speak to the in base stuff since I commute, but it will vary month to month on how 'senior' reserve goes. Flew with a reasonably senior reserve guy the other week that was out of base since we apparently ran out of FOs. So don't always expect to sit around and not get called.

That said, in base + reserve sounds like a dream some days compared to the forever commute. You'll probably enjoy it if you can manage the sleep when on trips.