Third line, "it's" should be "its"
as for the XGUI part: "allows for the dynamic configuration of almost every item held within the ULX environment"
--The only thing missing really I think is addForcedDownloads and per map/gamemode configuration.
As for other various suggestions by me.. well, here's my version:

ULX
ULX is the oldest lua-based administration mod released for Gmod, and it is the admin mod that almost every other admin mod has compared itself to or claimed to be better than.
Not just an ordinary administration mod with kick/ban features, ULX contains many useful features to assist in administration and server management (reserved slots, detailed logs), or just fun punishments (blind, slap, maul).
Combined with its module system and a supportive forum community of developers and ULX users, the possibilities of extensibility are virtually endless.
ULX SVN is constantly evolving to keep up with advancements in Garry's Mod.
Our newest menu system, XGUI, allows for the dynamic configuration of almost every item held within the ULX environment, provides quick access to commands, and has active user, group, and team management-- all from within your favorite gamemode of choice.
While attempting to please the graphic oriented users, ULX's core functionality still allows for complete configuration and administration of servers where admins prefer to use raw console access.
(Ended up adding/removing/changing more than I originally planned.. Oh well, the changes are here for you all to look over

)