I have all the U3 apps from this site installed to my SanDisk Cruzer. If I leave "Automatically check for updates" on, the apps come up with available updates.
I switch off the automatic update checks as I presume they will not be U3 versions.
I did wonder though if (say) allowing U3 FF 188.8.131.52 to update to 184.108.40.206 would still result in a U3 app - or would it become a normal Portable App?
What experiences have others had of this?