The rest of the world knows it as IPSC (said ipsik), but we here in the US call it USPSA.
And yes, it is lots of fun. The rules are less stringent than IDPA, and round counts are usually considerably higher. It is more fast paced and I definitely enjoy it. This is from my 2nd USPSA match that I ever shot. If I could shoot it again I could easily cut down 5+ seconds.