I install Solus on my work PC.
Software center recommend me update my software - i choose update(core, security and other packages) all and click apply(or OK, i do it on russian local, not sure)
Maybe cause of job network or any other reason(like i'm from Russia) updates not loads(unlike of ubuntu like distros where is all fine with load from any repo's)
Progress bar hung, i don't have cancel update button - live my work PC on 16+ hours(go home to sleep) - nothing changes.
Reboot PC - try load update again - same story.
Funny thing from my home PC updates loads very well - ~15min
I think it some job network problems.(again - browser and other network depended apps work well)
But i think user need possability cancel updates if he like me have some trouble with load your updates.
I read Solus not support downgrade, but possability canceling update in load package moment - be nice.