Shiira integrates very tightly with Safari - which causes problems for me. For example, if I tell Shiira not to accept any cookies, Safari also stops accepting cookies. I would much rather use a WebKit-based browser, such as OmniWeb, that doesn't integrate so that settings in one browser stay in that browser (I use each browser for a different purpose - I use Safari for most sites, but some require something else). Shiira's integration seems almost Microsoft-like, which to me is scary - I don't want to see this behavior in Mac OS X.