Do you think that performance is everything? or even do you think that deployment from an .ear file is very important? I don't think so.

Have you ever had a complete cluster of at least 20 servers? In that case Weblogic is one the best and I think for serious clients who are concerned abt more than 100,000 users, robustness is everything !

For more information you may check this link:
www.javaworld.com/.../jw-0223-extremescale.html

What abt robustness of Orion or OC4j?