My trusty 42 year old Vivitar 5000 ring flash still works as advertised but really only has 2 modes; full manual and 1 stop of automatic. I want a lot more control. I honestly don't see that much use for auto or TTL, but would like flexibility when it comes to being able to vary the manual output. Nikon's are outrageously overpriced and I just cannot justify the cost for as much use as it will get.