What do you mean when you say “they pulled them from the site?”
I’ve just ordered a full magnetic kit from them.
In my view step-up rings are a pain in the butt, which is why I chose not to go with Kase or Nisi, just too fiddly in the field. On the weekend I used the BT system in the field shooting waterfalls and it’s excellent. Just attach one ring to the lens, drop in the Dark CPL, rotate and you’re done.
i can’t wait for the new magnetic wheels to arrive, as rotation will be a touch easier.
I no longer own any 100x100mm ND Filters as they are now all magnetic in CPL, 3-stop and 6-stop Dark CPL, 10-stop and Night Filter.
I just spoke to him for 45 min I told him the same thing that the XD ND still had the magnetic filter on his site. He is the industrial designer and not that on top of things when it comes to how the company opererates or web site he is spread pretty thin.
I have the 77mm wheel and it is better but also thicker and too large for what it does IMO. It is still jerky and I find a silly way to accomplish the task of rotating the CPL and greatly prefer the Kase magnetic CPL with its traditional knurled edge to rotate it like screw on CPL's.
Graham is a designer and is very interested in customer feedback on how his products work and feel and we discussed the CPL operation. He was open to what I liked or preferred on the Kase filter adapter and how the wheel rotates the CPL much smoother. But in the end I am very much against magnetic filters now period in any shape of form, read on.
He told me five times he is not a proponent of magnetic filters and said he says right on their site (I did not see it) that magnetic filters are not designed to replace screw-on filters. They are for people who use square filters a lot and he does not like square filters for ND's because of light leakage. With the GND's that is not an issue with the faster shutter speeds.
I do not mean to disagree as I went that route too with the Breakthrough magnetic system it seemed like a neat set up. But after playing with them for several weeks the whole thing just made no sense and frankly is a pain in the butt from a handling, storage and usability standpoint. You might come to the same conclusion as I did once you try them out yourself. In any event I will give you my two cents and what the Graham himself said about them.
The screw-on filters are much more straightforward and easer to use. With the magnetic setup from Breakthough you either have to store six huge 105mm multi-piece adapter rings which take up a lot of room or
you have to screw in a step up ring per Graham, then screw in the magnetic adapter ring into the step-up ring then plop the magnetic filter in which is a three-step process and a waste of time.
Three steps insead of two when you traditionally use a step up ring then the filter which rotates like it is designed to. For the ND's you stop light leakage in its tracks versus square filters.
The only issue he said is some vignetting at 16mm with round filters be it screw on or magnetic.
I have as many lenses as anyone and 90% of them are 62, 67, 72, 77 or 82mm.
I will take four high quality solid yet thin high quality Breakthrough brass step up rings to 82mm any day of the week in place 105mm multi-piece rotating Breakthrough's adapter rings.
Typically I only employ two of them the 72 or 77 anyway so it is a very small price to pay for eliminating a dozen filters and works quite well.
We can agree that Breakthough has some exciting products and what I feel it the best glass from a sharpness and neutrality standpoint that money can buy.

Breakthrough knurled brass step-up ring

Breakthrough adapter ring and magnetic filter 105mm in diamter cannot fit in cargo shorts or camera bag lens slots due to size and no lens caps

Breakthrough adapter ring

New Breakthrough 77mm wheel for magnetic filters still 105mm in diameter too large
--
-Terry
https://you pic.com/photographer/TerryRStahly/?mode=portfolio
https://trstahly.format.com/work#
https://500px.com/trstahly