(Most) third party xtras require payment before you can use them. This is the only real "disadvantage". And I can't see any advantage between different methods.
The advantage of using a 3rd party Xtra is that you may not need to restart the projector after installing QT. As you said, quickTimeVersion() depends on the QT Xtra and actually "kick-starts" the Xtra. If you find that you have to install QT then you'll have to quit the projector before that Xtra can work.
Using a 3rd party Xtra allows you to determine which version of QT (if any) exists, install if needed, and continue without restarting the projector. This assumes that the QT install does not force a restart of the computer.
-- Mark A. Boyd Keep-On-Learnin' :)
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