
It contains an amazing built in AO and flight assist. It has inventory loading performance improvements not found anywhere else. It has recent LL features such as mesh rendering, mesh upload, multiple clothing layers, depth of field, and has a very high framerate. It contains optional remote scripting support for scripters or RLV users. It lets you double-click teleport within regions correctly, even in places where the standard viewer can have problems. It has a radar that is accurate far beyond your draw distance, even very high in the air. It has a much richer radar than the standard client. It lets you place notifications and popups in various parts of the screen. It contains a wide array of additional windlight presets, as well as system to automatically set your windlight presets on particular parcels. It contains a number of user contributed skins and color schemes. It supports both pie and rectangle context menus, and both solid and high-transparency looks. It has a number of tools for builders that are not in the standard viewer. The viewer is highly customizable and configurable, with 3x the options of the standard viewer.

Right from the login screen, it can be configured to run in a V3 mode with Starlight skins, a V1 mode similar to Phoenix Viewer, and a hybrid mode that contains a blend of both. For those who were not aware, the Phoenix/Firestorm Team released the Firestorm viewer a few days ago. Since there haven't been any official posts, I thought I'd throw one in as Firestorm's development lead.
