Hi Rich,
Please see my answers below.
1) On what dates did you take each CAT? Were they in the old format or the current, shorter format?
They were all in the old format. Q 37 questions and V 41 questions.
2) Did you take the ENTIRE CAT each time (including the Essay and IR sections)?
I had the opportunity to choose the order on each of the CATs I took. My order on all three tests were Q, V, IR and AWA. No, I skipped the IR and AWA part after completing Quant and Verbal.
3) Did you take them at home?
Yes, I took all three test from home.
4) Did you take them at the same time of day as when you plan to take your Official GMAT?
I took the first two tests during the same time I have my final CAT scheduled, 9:30 AM. However, I took the third test at 4:00 PM.
5) Did you ever do ANYTHING during your CATs that you couldn't do on Test Day (pause the CAT, skip sections, take longer breaks, etc.)?
No, I never paused or took breaks longer than 8 mins.
6) Did you ever take a CAT more than once? Had you seen any of the questions BEFORE (re: on a prior CAT, in an online forum or in a practice set)?
No, none of the questions were repeated.
Regards,
Omer