Am looking for feedback on a flash system for MF Macro photography (I shoot Bronica ETRSi and have the 105mm PE Macro as well as the Auto Bellows Attachment).

I am considering the Sunpak DX-12r along with the TTL cord (BR-1D) but was wondering if the light will be flat using a ring flash. Do the two light macro systems work better - even though there is no TTL compatability with Bronica.

How are the results using TTL Flash with macro photography?