Samba networks do that for me on Windows too, despite the ability to refresh the window.  More often, it'll crash Explorer rather than actually update the info if something is already clogging the tubes.  Plus, network shares almost never update that quickly, and expecting them to do so is rather ridiculous.  Round-trip time to a server clearly wasn't implied as part of the Finder update speed.<p>And again, I'll point out that the terminal is right there.  If it's <i>Finder</i> that's slow, the terminal will still work.  If the <i>terminal</i> doesn't keep up-to-date, then it's a problem with their implementation of Samba, not Finder, and a refresh button would do nothing (except maybe nail your network with unnecessary requests by most people mashing it when something doesn't work).