object databases

I posted this to comp.databases, but then it came to me that you guys might provide some suggestions, sorry if this is an OT:

So after years of using strictly relational databases, I've begun to consider an alternative. Object databases seem compelling, especially since the data in the project I'm mostly involved in is highly hierarchical. So the questions:
1) When would you recommend ODBMS, and when RDBMS?
2) Which ODBMS would you recommend?
3) The application I work on is single user desktop application. The data resides on the user's computer. Is there any ODBMS suitable for this (something like equivalent to MSDE, Access, etc.). Is there any "lightweight" object database suitable for this, or would you recommend something else instead?

Thanks,
Sasa
.

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