I have been very satified with the functions of the Nissin Di700A and AIR commander. I wrote about it in October here on SAR: http://www.sonyalpharumors.com/guest-post-by-dierk-topp-the-new-nissin-di700a-air-1-wireless-ttl-flash-for-sony/
I use it with different setups like umbrellas and diffusers. Yesterday I noticed, that the flash was hanging down from the tripod, only fixed by the cable of the PS8 power pack. The diffuser has been mounted for a while as you see on the first image. The wheight of it is about 160 gr. very light!
Is the Di700A only for amateur use??