0.7.2 is perfectly fine, there has only been a few minor bug fixes since then:
https://github.com/user-none/Sigil/b.../ChangeLog.txt
I am sitting on 0.7.3 for now (just haven't felt like updating, and the numbered entities might mess with some of my Regex and I don't feel like updating those (even though it would only take a few seconds)).
Reminds me of people needing to update Calibre every single week... if you don't need much/any of the bug fixes in this week's update, it is not imperative that you update to the latest and greatest... it is still the good ol' Calibre that has been treating you well up to now.