Aeron Classic Lumbar Replacements from Amazon kinda suck... Is Crandall's any better?

So I bought one and it wouldn't stay on the rail so I just tossed it and tried to glue back together the original as it completely burst.

That worked for a few months so I bought another from amazon and it seems to stay put when you adjust it but it doesn't support as well. It bends/bows to the point where only two points are supporting my lumbar.

Is the one from Crandall any better or are there any better replacements?