Bit the bullet on the Blurfix3+ 55 w/ CYD. Again, not that anything was wrong with the Backscatter, I just felt like this was the better choice for me.
Online transaction went smoothly, and package arrived very timely. Some extras that had been offered during the pre-order process also arrived, which was a nice touch. It's much lighter than I expected. I don't know why I expected heavier, I just did. Maybe due to a hefty glass 52mm ND filter I once had for an earlier handheld camera. That's my only experience with optical filters.
I did have some difficulty getting the Blurfix onto the camera housing. I was pretty sure I was going to break it, given how hard I was muscling it on. So I abandoned ship, and let it sit over night. Next day, gave it another shot and finally got it on. It's a very tight fit, and I understand that snug is good, if sealing against the elements. Have to put your back into it a fair amount, and I'm interested to see if that changes under water.
Time will tell of course, as I haven't used it yet. We leave for the Philippines this coming weekend, so I should have plenty to report in a couple of weeks.