Hi Hal I'm bit new to the wonderful world of flash photography Here's what I have and how I currently use them
(Four Speedlights + Four FlexTT5 units)
1 x SB800 on a FlexTT5 3 x SB600 all on FlexTT5s MiniTT1 on Camera SU-800 on Mini Sekonic L-758D
Most of the time I use all speelights in Manual mode through SU-800. The reason for buying this setup was to control the light output remotely from the camera without adjusting each of the speedlights.
Whenever I'm in manual mode (i.e. 95% of the time) I use the L-758 to meter prior to shooting. On the rare occasions I'm on CLS I do NOT meter.
As for type of shooting, currently it's limited to garage, living room and macro shooting with speedlights
Having to fire the shutter or the test button on mini every time I have to take a meter reading is the only nuisance I have at the moment. So despite seeing few posts in various forums about the incompatibility I ordered a RT32 module for my L-758 thinking I might be able to fire the speedlights from L-758 to take meter readings.