Not since the 1980s. They were the grips of choice for a while, I used them for years.

Sorry toi hear about the numb hands that you and others are experiencing with the ergonomic style grips. My desire for Ergon is waning.

The only problem I can recall with the Grab-Ons is that they can slip in wet conditions. I prefer lock-on type grips for that reason, but I've found that "dual density" grips stay put too, I think because the stiffer inner layer isn't very stretchy.

If you don't ride in the rain much, the foam grips should be fine. Well, you know they work for you. Good luck on solving that numb hand situation! If you don't have barends yet, you should get them. Being able to change hand position helps alot to prevent numb hands.