I never liked Transmit 3 for some reason and feel it doesn't worth $29.95 when I can do pretty much the same with Cyberduck for cheaper—free! But now I tried Transmit 4, and fall it love with it within 10 minutes. WebDAV is fast even on my faulty connection (listing over 3000 files, which Cadaver never seems to finish) and Disks pretty much replaced ExpanDrive for me.
Great job, Panic. +1 Purchase.