Plenty. Particularly if they've been making pens for years, and/or if they already have an investment in kits/bushes. Someone new to our craft would not know any different.
At least we can agree on that. Pick and Mix might have a place amongst newly introduced kits - a new concept as it were, but for very sound reasons manufactures are unlikely to retire tried and tested kits in favour of it or amend their designs to conform with it just so that people don't have to make a one off purchase of a set of bushes.
