I'm still not sold on this addition, however, if I was doing more diving than I do currently this would probably be an easier decision to purchase. For me I wished that RETRA had been able to make it fit in the current battery compartment of the strobes rather than adding the extension. With the short pre-order period it also kind of feels like RETRA wanted people to make quick purchase decisions rather than doing some analysis like was done by people above. After people have used it more and have gotten more performance data it might then be a future option for me to look into again.