Purchased these because the original brushes from Phillips are getting harder to find, and expensive.
These fit securely to my handles, and don't appear there will be issues with the small “alignment pins” breaking off as happens so often on the Phillips brand.
The bristles seem to be firmer than new Phillips, so I'm thinking they will hold up well.
I have not used them long enough to know how the “replace me” fading bristles are going to work.
The magnets seem to be as strong as the Phillips brand, and their scrub motion is equal.