[Zope] ZCatalog and random key error

[Bak @ kedai]

hello all
i'm about to venture into building a ZClass that will make use of ZCatalog.  
is it 'safe' now?  i see that my zope2.2.2 now haven't encountered any random 
key error yet.  what about others?

also, will iterating through catalog index faster than iterating through 
..say.. objectItems('meta-type')?

looking for insight, advice, holes to avoid, etc

thanks

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use Zope?  then you got HOPE!