Xume 82mm Lens Thread to Filter Holder Bundle, 2 Holders, Breakthrough Photography 82mm Center-Pinch Lens Cap, 82mm Adapter

I bought this bundle and a few extra Xume filter holders for my filters after I had my 10 stop filter get stuck on my lens while at the beach. Fortunately, I was able to get it off after several weeks of trying different things.The system is clever and the magnets work well. Perhaps a bit too well, as I find it requires a bit of fiddling to remove the filter. It's faster than unscrewing a filter, but not as fast as I had originally imagined. On the plus side, I have no fear that my expensive filters will fall off if I accidentally knock the setup.As some reviewers have mentioned there are 2 issues with this system: 1) The filter threads are a bit sticky so it can be hard to remove a filter. I don't tighten the filters and that seems to address the problem. I wish the material were of higher quality so I wouldn't have to worry about getting my filters stuck, which was the reason I bought these. 2) There is definitely vignetting on my full frame camera and 24-70 lens. I get vignetting from until 40mm. If I use the APS-C crop mode on the camera then I don't get any vignetting. I suppose it'll depend also on your lens and filters. Perhaps if I had a thin filter ring instead of the normal size rings?I debated whether to return it, but frankly it's too much of a pain. Besides, I've been getting into longer focal lengths for my landscape photography so in that context I can see the advantage of this system.