The number of features it includes surpasses any other plugin, not to mention it combines so many great tools into one simple package. I simply cannot find anything more I prefer. I HIGHLY recommend it.
No issues at all here with Glims on Leopard. No idea how it is on Snow Leopard as I'm still on Leopard myself. Adds so many options that Apple should have included already. If you use Safari, it is a must-have add-on.