Kase circular magnetic filter

[@imagesBV]

Does any one have experience of these?...looks so easy to use and I'm tempted to ask Santa
No more screwing on a square holder and slotting filters in would be a great enabler for landscape shooting.
My only issue with the SRBs I use now is colour cast sometimes on ND and ND grads

[Skyelines]

No personal experience but have a look at this video https://www.youtube.com/watch?v=txhT3VvKpFE the Kase filters item starts around 13:30