The Van der Hagen Boar Brush I had (that was part of a brush, soap & mug set that my parents gave me for Christmas one year) sat around unused for a long time while I used cartridge razors and canned shave gel. When I did start using the Van der Hagen boar , after I switched over to shaving with a DE razor and finished off the canned goop, it shed horribly. I continued to use it (picking boar hair off of the soap puck and off of my face) until the center of the knot fell out leaving a halo of boar hair around the outside.
After my experience and hearing about similar stories I would not recommend Van der Hagen to anybody. There is so much out there that is so much better quality for about the same price and even more that blows it away for somewhat more.
About a year or two ago they finally stopped selling their old handle style that they had assembled themselves since the Surrey days and replaced it with a Chinese made brush with a black Persian jar style handle. They use a similar handle for their badger brush.
My first brush back in 2010 was a green handled VDH and, like many others, had it fall apart within a few months. I don’t know if the new boars are any better. They may very well be.