It is always great to see independent reviews of GlassFish. ZeroTurnaround's Sigmar Muuga did a pretty cool review of GlassFish recently (recall that these are the folks behind the popular JRebel tool). He covered download, installation, startup, tools, admin console, community, documentation and support.
Here are some quotes from Sigmar:
"So, what makes GlassFish so special? I think the most special thing is that it is developed by Oracle, so it comes from the home of Java – our bread and butter."
"I haven’t used and managed GlassFish myself but I must admit that crawling through the docs, forums and mailing list made me feel secure. The forum is quite active, there are many mailing lists specializing on different parts and areas of GlassFish and the documentation looks pretty good."
"It looks very big but is actually relatively small – the installation package is around 53 megabytes in size."
"DevOps guys will probably love it when they see Glassfish’s Administration Console (you can click around and imagine yourself being an airplane pilot)."
You can read the full review here. Note the comments from me and John Clingan.