Compilation of emulated versions of all the original US arcade releases (not later "Gold" editions, etc) of Street Fighter, Street Fighter II, Street Fighter Alpha, and Street Fighter III. Only SFII Turbo, Super Turbo, Alpha 3, and 3rd Strike have online and practice modes. Also worth noting since these are the US releases, they don't have later tweaks or bug fixes some of the Japanese releases did (so Super Turbo always plays at the highest difficulty no matter what you set it to, for instance) (Capcom later released a version for Japan that uses the Japanese versions for single-player, but the US versions for online play).
The games play pretty well; for instance, the version here of 3rd Strike has a frame or two more input lag than the PS3 version, but is otherwise more arcade-accurate--the PS3 version was based on the PS2 version, which was based on the DC version, after all. Cheat codes that worked in the arcade versions work in these versions. You get standard difficulty type settings per game; you don't get additional options like being able to turn off super meters or anything.
You do though get Street Fighter III: 2nd Impact's widescreen mode option, which is definitely a sight to behold:
Ryu's light punch in 30th Anniversary's version of Champion Edition has an input delay--as measured in my incredibly crude cell phone footage way--of about 5 frames, occasionally rising to 6 frames. (Compare with CE in Street Fighter Collection 2 on PS1 (see entry 1367), where I measure a delay of 4 frames, occasionally dropping to 3 frames.)