Erm, no guarantee about the rotors - I'd have a slipperential as added piece of mind - it allowed me to calm down (and not be so on edge worrying that this corner would be the last...) - so I got my best result ever - 4th in A Final after 20 minutes and only ~20s behind 1st place. I'd recommend it for UK tracks if using the T8 motor. If your local track is closer to a US track, then you have less to worry about.
The Zippy will be fine for testing - when you've got some good run time figures from that, then you know what capacity you'd need to get different run times. E.G: If the 5000mAh 5S pack nets you 25 minutes on the track (very different from bashing - I got about 1.8x the run time when bashing), then to do 15 minutes you'd only need a pack with 60% of the capacity - so a 3000mAh pack.
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