I imagine a whole bunch of power could be derived from this in Haskell. I don't know how heavily contracts were/are used in Eiffel (I don't think it's so popular these days).
It would be great to know if contracts had a measurably useful outcome on projects and what that measurable was (addressed a market that we otherwise wouldn't have been able to, dropped runtime errors to only system based errors, etc).
WRT your projects, I imagine it would be great to see your product out there working with a known level of uptime and quality. I could imagine it's a bit of a shift from the normal "throw it together" of ... a lot of software.
I'd be curious to know what it's like to work on day to day, year to year. I imagine lots of software will still be "throw it together" for a long time yet, but even if the subsystems are formally verified, it could have a useful impact on the software that consumes these (verified) modules.