While I routinely only use a few of the many features, the ones I do use have become essentials for me. The developer continues to post a new update very promptly following an update to Safari, so there’s little time to suffer withdrawal symptoms—and the built-in “Saft Update…” in the Saft application menu makes the updating of a registered copy easy.

And until you update to the compatible version, it self disables the no-longer-compatible version—with a notice to you when launching Safari—so there’s no adverse impact on using the new Safari right away, albeit without Saft’s features. (Seems most of the reports of problems with Safari v3.2 are associated with other 3rd-party “add-ons” not being so well behaved.)