I've been trying Personna medical blades recently. Very good in my Tech, but a funny thing happened when I put them in a EJ DE89L. As the shaves add up and the blade dulls, it doesn't feel rougher, but rather smoother, and it cuts less. It almost feels like the blade is receding into the EJ's somewhat bulky (compared to a Tech) head and gradually disappearing.
Anyway, this morning I lathered up, grabbed the DE89L and made one smoooooooooooth stroke on my cheek. So smooth, I did a double-take.
...No blade. Forgot that I tossed it after that last shave.