Well, I wanted an off-camera flash for macros, etc. I usually shoot available light, but sometimes I just want a flash too (I just built a ringflash too).
Anyway, I love it. I am a relative newcomer -- sort of like Rip van Winkle because I had been a 35mm person for many years but out of photography entirely for about 15 years until last summer. Going from my old Vivitar 283 (which I still have and use) to the 430 was a quantum leap. I wrestled between this and the 580, but the cost difference didn't seem worth it to me at the moment and the 580 is considerably bigger/heavier. I didn't need it for a master, but when I decide I need that, I can buy a 580 and use the 430 as a slave.
I shoot a little bit of everything except formal portraiture.
I have bought lots from amazon and they haven't been a problem at all.