[zenspider]

they certainly didn't work fine when I tried to use them... after they'd gone into production releases of perl, the canonical demo/example scripts that were out there all crashed the perl runtime in a fiery horrible death.

I can only hope that it has improved since then, but I've moved on to greener pastures.

[kingkongrevenge]

They were clearly marked as experimental in the documentation all the way up to recent 5.8 releases. From what I hear they work fine now.