Hi BioAlien
hm... depends on you
I can speak for myself: I never did a ispcp-update with the update script... nevertheless I try to update the productive servers (just increased to 5) from RC to RC version - except when there are improvements I need immediately.
Since I read about some failures even when using the update-script, I maybe would recommend to do a manual update - a big step.
Just make a good backup before... :-)
One thing: with RC4 there was introduced a db-update function, eg. DB Revision from 1 to 2 fills the mail_addr field in the mail_user table... (usefull for some tools when they need this field).
Sometimes also very helpful:
http://www.isp-control.net/ispcp/browser/trunk/ where you can have a look at each file and see the revisions...
/J