I won't give up my Metz 58AF-1 or Panasonic DMW-FL360 because I already own them. I'll acquire the FL-600R for camera bag carry since it appears to be simultaneously smaller and more powerful than the FL360. When I do an in-situ portrait or model shoot, I'll rent Nikon flash units for the CLS function that I have come to know and love having used them over the years with the D700 and D300. I need to reinvest in newer flash units since I liquidated my well-used inventory of Nikon SB-600s, SB-800s, and SB-900s; however, I don't want to spend the capital on the newer Nikon or Canon flash products. For what they provide, these expensive, name-brand units take a bit of time to get the ROI. Other than provide a huge amount of light, they do very little else so the capital outlay does not make good business sense. I have heard good things about Yongnuo from friends and fellow pros. The YN-560 II has a GN of 58 and is selling for $88 at Amazon at this time. The equivalent-output Canon 580EX is $604. The equivalent-output Nikon SB910 is $547. I can get 6 of the YN-560 II vice one of each of the other two. I'll still use my Metz for event work that requires it to be on a flash bracket as I move around; however, the YN-560 IIs, like the Nikon, will be transported in a Pelican hard polymer case and setup with umbrella or stand-alone and returned to the case after usage. Rigorous usage will be minimal. Anyone have experience that they care to share about any of the Yongnuo flash product line?