No, they are not.
The clear plastic two color ones are prone to having the rim snap off with ejectors.
The brass spring loaded primer on some of the short red aluminum ones is too soft and dents too deeply too fast.
The A-Zoom aluminum ones with the elastomeric primers seem to work well.
The chrome plated hollow brass ones are next to the best in my opinion. I don't see how the weight is straining the ejectors too much as I have never had a hint of an issue in 25 years or so.
The best I have ever had were some older solid red plastic ones with an elastomeric "primer". I don't remember who made them or where I got them. I also have some old solid black plastic ones with no separate primer that sill work but the rim "looks" weak. They looked weak when I got them 25 years ago.
