I'd heard that the old ones (v2) were 7/10 reliable, whereas these v4 ones seem 9 or 10/10 reliable - only started to fail when the flashguns were getting tired, so it was the batteries...other gear is a Sekonic L-308s meter (it's a little on the frisky side, light wise, but good) and I already had the two Vivitar 283/default.jpg" /> I'd heard that the old ones (v2) were 7/10 reliable, whereas these v4 ones seem 9 or 10/10 reliable - only started to fail when the flashguns were getting tired, so it was the batteries...other gear is a Sekonic L-308s meter (it's a little on the frisky side, light wise, but good) and I already had the two Vivitar 283/0.jpg" /> I'd heard that the old ones (v2) were 7/10 reliable, whereas these v4 ones seem 9 or 10/10 reliable - only started to fail when the flashguns were getting tired, so it was the batteries...other gear is a Sekonic L-308s meter (it's a little on the frisky side, light wise, but good) and I already had the two Vivitar 283/1.jpg" /> I'd heard that the old ones (v2) were 7/10 reliable, whereas these v4 ones seem 9 or 10/10 reliable - only started to fail when the flashguns were getting tired, so it was the batteries...other gear is a Sekonic L-308s meter (it's a little on the frisky side, light wise, but good) and I already had the two Vivitar 283/2.jpg" /> I'd heard that the old ones (v2) were 7/10 reliable, whereas these v4 ones seem 9 or 10/10 reliable - only started to fail when the flashguns were getting tired, so it was the batteries...other gear is a Sekonic L-308s meter (it's a little on the frisky side, light wise, but good) and I already had the two Vivitar 283&hl=en&fs=1&rel=0&autoplay=1" /> I'd heard that the old ones (v2) were 7/10 reliable, whereas these v4 ones seem 9 or 10/10 reliable - only started to fail when the flashguns were getting tired, so it was the batteries...other gear is a Sekonic L-308s meter (it's a little on the frisky side, light wise, but good) and I already had the two Vivitar 283&hl=en&fs=1&rel=0&autoplay=1">