The YN460 and a set of Cactus V4 triggers was my main flash set-up for a very long time. I got both the flash and the V4s together for under $100 and they were very reliable. The only reason I now use something different is due to a set of rechargable batteries having a melt down inside the YN460 and killing it, and the V4s were dropped, kicked and generally abused just a bit too much.
From reading the thread, I'm guessing this the type of thing you want to hear:
- YES, the YN460 will work in the hotshoe of your K-X
- YES, the YN460 will work as an off camera flash/gun using either a cord or wireless triggers.
The flash is fully Manual though, but very easy to adjust and use. When on camera the K-x will "see" a flash attached and in Av, Tv or other auto modes will guess at a good setting taking into account a flash is being used - all you do then is use the camera +/- flash compensation, or the up/down power adjustment on the flash to get a good exposure.
Off camera, use what ever setting you want and manually dial in the flash power as needed and trigger it using something like the Cactus triggers.
As mentioned previously in the thread there is a new model now, the YN560 and although V4s are still available, V5s are out now.
My old set-up, K100D, Cactus V4 and YN460:
YN460 off camera triggered with the V4s and the flash as the main light
YN460 off camera triggered with the V4s and the flash as fill light balanced with natural light
YN460 on camera, Av mode, flash fired up into bounce card:
Whether you use a bounce card, diffuser, or any other form of lighting modifier is completely up to you and the look and style of image you want to achieve.