Stress testing and optimizing SharePoint 2013 shredded storage with traditional and RBS…

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Small correction/clarification- the Rank Tool can be installed in on-premise environments (it is available in the store) but, as documented, it will crash after a known serious of events. This should be resolved with SP1.
Hi, thanks for the post.
I have few questions
Question 1: Are there are any drawbacks or limitations of creating the custom ranking model through RankingModelTuningApp in SharePoint Online?
Question 2: Can you please share details on creating the judgement sets? I tired with the below method but the managed properties for HTML, DOC, PPT, XLS, TXT are not getting generated in the Add and Tune features section.
The import file must be of type XML with the following schema:
<QuerySet Name="testRM - JudgementSet">
<Query QueryString="query1" >
<Judgements>
<Document Url="docUrl1" Label="Excellent" />
<Document Url="docUrl2" Label="Good" />
<Document Url="docUrl3" Label="Fair" />
<Document Url="docUrl4" Label="Bad" />
</Judgements>
</Query>
</QuerySet>
You can use four labels to indicate how desirable a result is for a query: Excellent, Good, Fair, and Bad.