I put stock shock towers back on my emaxx, sure they snap on a hard impact to the shock tower, but they don't flex. I was bending shock shafts with the rpm towers just by jumping the truck.

I don't recommend aluminum shock towers with aluminum bulkheads either. Aluminum bulkheads are nice, however when you add an aluminum tower, there is no longer a flex point if the truck lands on the lid. I was running flm hybrids and flm shock towers, and had a pretty bad upside down landing. It snapped the chassis off where the bulkhead bolts on.