I have 2 of the 3 items since before Christmas. However, I am still waiting for the part that fits onto the camera. For some unknown reason, it has been back ordered for almost 2 months now...so good luck if your trying to go this route like I am.
I am trying to build my Pentax macro rig up to the level of my Canon system. It has been a hard go, and I still haven't bought a macro lens yet for it...waiting for that pesky Cable F part to come in.
Anyhow, I have found macro photography looks best with the flash off camera and a diffuser attached to the flash. This not only softens the lighting, but also decreases the chance of overexposure somewhat.
I know I have posted this photo to death, but here is what I am talking about. I have found the large Lumiquest softbox perfect in directing the light where I need it the most. Also, the larger surface area really lights up small objects with a nice pleasing even light. Just an idea. I know quite a few people who have made their own flash diffuser using paper. It all does the job.