Excerpt: My experience with flashes is as follows : Pentax AF280T, Vivitar 285HV, Pentax AF500FTZ, Yongnuo 460, Yongnuo 560, Sigma 530 ST DG and now the Pentax AF-540FGZ. I've tried a bit of everything.
Pros: Powerful, offers just about every control possible
Excerpt: A good powerfull flash, which matches the Pentax bodies brilliantly. For easy photography it works very good: TTL techniques makes sure you get a well-lit image. Tilt and swivel head makes it possible to to use the reflective walls/ceiling and more depth in the image. That was the reason to buy a 540 (and not 360 instead, although I did not need the enourmous power of the 540).
Excerpt: This is my workhorse flash for DSLR use. I've become addicted to the wireless mode. Put this on a shelf somewhere, aimed at the ceiling, and use the camera's built-in flash for control and fill, and you get professional-looking results anywhere. I've used this setup for everything from children at play to indoor architectural shots.
Pros: Nice power, wireless features, good manual modes
Cons: Does not have the professional build of older flashes
Excerpt: I bought this because of more power and ability to twist horizontally, as well as vertically, compared to 360 model. I have started trying some things out in high speed and other modes. It is definitely a step up from just the pop-up flash on K10D. There is a bit of underexposure by default. But you can set flash compensation. I also took others' advice and got a Sto-Fen omni bounce flash diffuser to provide more flattering light.
Pros: Powerful flash. Vertical and horizontal swivel positioning
Excerpt: I purchased this flash because my old Phoenix worked only in manual mode on my K10D. I needed a programmable flash that was reliable and as my camera is Pentax, the choice seemed obvious. I don't use a flash all the time but, in testing it out, I have found it to be fairly easy to use with the exception of the modeling light (many don't use it but, in low light it's needed). I have not figureed out how to make it fire automatically.
Pros: The major strength is that it works with my new cameras in all modes where my old Phoenix did not. Another strength is it's ability to be used as a slave flash.
Cons: Thusfar, I have found no real weaknesses in this flash unit.
Excerpt: Вспышке больше 5 лет, пока работает, но в середине линзы френеля начала выгорать пластмасса (видать была загрязнена), теперь после каждого мощного пыха вспышка весьма характерно начинает пахнуть жженым пластиком и в воздух поднимается небольшой дымок. На работу пыхи это не сказывается, всем говорю что вспышка старинная магниевая ) мол так и должно быть. Прошла суровую жизнь в тур походах и не менее суровые испытания в пещерах.
Pros: Хорошая вспышка, всё что надо - есть, рабочий TTL, высокая мощность
Cons: Немного большевата, механика зума очень чувствительна к тряске и ударам, хлипкое крепление широкоугольного светорассеивателя.