The adapter + wireless ttl transmitter is certainly lighter than Sony flashes - why the worry? Unless you really need on camera flash.
Each of our needs are different.
When shooting a wedding (which is my primary use of Sony cameras), the speed-light connection to the camera is the most vulnerable part. Back when Canon made their flashes with plastic mounts, breakage was not unusual … no, actually it was all to common.
The more connections from flash to the hot-shoe the more vulnerable it gets. I had to be very careful when using the Phottix transmitter on the A900 … and that was using the more secure older Minolta style hot-shoe connection.
Hopefully, Phottix will deliver a radio enabled speed-light with the newer Sony multi-functional foot.
The way I use these is on-camera pass through TTL for fill, and the radio function to trigger the key off-camera light … either another speed-light (not often because of thermal shut down), or more often a portable strobe (which never shuts down under heavy use). Great combination for mobile, fast paced work like a wedding or event … even location portrait work.
- Marc