I don't know about others but I really like the two-finger double-tap to zoom (pinching too) and the reader mode (and reading list if you use multiple devices with safari). These things seem standard on mobiles but still haven't made it to all desktop browsers. Spotlight history integration is also useful as well, though it could be improved.
Otherwise, it's fast enough and supports most new features just fine. Developer tools support isn't quite as nice as Chrome but I usually use Safari until I need Chrome or hit a site that needs flash (since I don't have it installed on my system).
This is a nice feature. But if this is the only thing keeping someone using Chrome over Safari, then fear not: iOS6 is introducing this feature for Safari in the coming Autumn.
I usually used reading list to share across devices but it did take far too long for Apple to add the live tabs feature. Definitely a feature I wish I had up until developer betas awhile ago.