[Zope-dev] catalog upgrade - what about products which subclass zcatalog

I just upgraded my site explicit ZCatalog objects using Chris's very helpful http://www.zope.org/Members/mcdonc/HowTos/UpgradeToNewCatalog instructions - but I have a bunch of catalog aware zclasses and some zclasses which (eg zdiscussions things, based on ZDBase) use Products.ZCatalog - given that the base class has changed, do they need any tweaking to take advantage of the new b+tree code?