I hope this doesn't turn into sounding like an advert, but I just picked up one of these dual Nikon iTTL/Canon ETTL Yongnuo flashes and am well impressed. I spotted it in a buy'n'sell chain store window, at £28 UK (about $35US?). But it looked brand new when I got my hands on it - complete with protective film on the LCD screen and smelling like new. And at that price it would be rude to turn it down! "Get on with it" - OK, enough preamble. First the few minus points: Only works as an i-TTL/ETTL slave - no commander ability. Has nowhere near the claimed GN (measured at ~30 @ 2.5m and 100 ISO) - but has this in common with almost every other flash ever sold. The pullout diffuser is very tight to pull out. Lock is a slow screw-down type, not instant lever. Recycle time could be a tad faster - but it's adequate. Sound feedback far too loud and annoying - needs muting in menu. No AA mode. Setup menu not intuitive, nor properly documented in manual. HSS not supported. Plus points: Works exactly as it should - delivering nicely exposed TTL shots, even when bounced. Reliable 'wireless' slaving up to several metres from commander flash. Also supports S1 and S2 optical slaving. Flash coverage up to 105mm setting. Manual power setting down to 1/128th. P.C. Socket and external HV power-pack socket. Clear LCD display with back-light. Small support stand included. Reasonable weight and build quality. Can be switched between Nikon or Canon wireless slaving, or both. To sum up: Nikon users get the same facilities as an SB700, but with one stop more 'power' and at a fraction of the price. Canon users likewise, but I don't know what the Canon equivalent speedlite model is. Recommended as a backup or budget option - or both! P. S. Now replaced with improved Mkiii version. So maybe NOS of the Mki and Mkii versions is available at a bargain price.