JimAde said:
So, question: Would it be worthwhile to Sim yourself? Say you are a 13th-level wizard (minimum to cast the spell). Would it be worth 1000 xp to have a perfectly loyal 7th-level follower who can cast up to 4th level spells and stand in for you in some situations? I'd have to say yes. In fact it would probably be worthwhile to have a few of them.
I had another question: What happens to simulacra if the creator dies? Do they melt? Are they free-willed? They can never grow more powerful or develop, but do they age? That Instantaneous duration leaves a lot of questions unanswered.
And what are the requirements for the repair ritual? Can the sim do it himself if the resources are available?
Questions, questions questions...
I think it's worthwhile to Sim yourself. Mecahnically speaking, your 7th-level sim is not very powerful. But it can be really useful from a role-playing standpoint. Having a cohort or follower to run errands is useful, having a second YOU lets you be devious.
Of course, in almost every case it's better to Sim a creature that can make itself look just like you, and still do lots of other stuff. I was going to mention a Dragon with Alternate Form abilities, but I'm afraid to mention dragons in this thread again (

), so let's say a polymorphing Planetar instead.
If you Sim yourself, you have a dupe of your entire skill set, too, so assuming you're relatively good at what you do, it should be trivial for your Sim to be able to give you an Aid Another bonus to just about any skill.
The healing/regenerating thing I'm still not sure about, but I'm leaning toward a "Sim's can't heal any damage" interperetation of the spell's intent...otherwise why call out that you need to pay 100gp per hit die to repair it, when you could just cast Heal on it and be done? If the intent was just that it doesn't heal damage naturally over time, they could have simply said this.
This makes the Sim almost completely a non-combat entity. It works great for running your affairs while you're out of town, or as a cheap source of SLAs, but you don't want to risk it getting damaged in a fight. I'm not sold on this interperetation, though, so please convince me I'm wrong
As for what happens to a Sim when the character that created it dies...it just keeps going. The creator doesn't directly control it, the Sim just obeys unquestioningly. It may not do much, but it won't melt away. (Note to self...order any and all Sims that I create that in the event of my death, have me Raised...).
Here's another thought...the Sim is static and unchanging from the moment it's created. Does that mean it doesn't age? Is a Sumulacrum immortal?