RTAS or HTDM Altiverb?

[Jaylaca]

I found this info on the Digidesign support faq about HTDM vs RTAS

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Q: In Pro Tools v5.1 and higher I can use RTAS Plug-Ins on a TDM system. Isn't HTDM the same?

A: No. There are certain limitations to using RTAS Plug-Ins on a PT 5.1 TDM system. In particular:

RTAS Plug-Ins can only be instantiated on disk tracks, not on aux tracks or on master faders.
Even on disk tracks, all RTAS Plug-Ins must be inserted before TDM Plug-Ins.
RTAS Plug-Ins do not support sidechain inputs on 5.1 TDM systems.
RTAS Plug-Ins must have symmetric I/O (i.e. 1 in, 2 out is not allowed)
HTDM Plug-Ins do not have any of those limitations.
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I'm running PT|HD2 6.7 on a G5 OS 10.3.8.

Am I right in reading from the FAQ that you cannot use RTAS plugins as an AUX send FX, but only HTDM/TDM?

I can't seem to find any other info to justify buying the HTDM version since it's quite a bit more $$$ than the RTAS version.

Can anyone recommend why I should shell out the extra dough for HTDM?

Cheers,
Jason