Content served to Google spiders should be relevant to the content shown regular visitors. Cloaking on non promotional domains tends to do better than straight promotional domains. Likely due to the boost from a real domain appearing in directory listings. No penalty for cloaking is applied if this criteria is met. Adequate spidering, and fairly thorough.
Initial visit is usually light, with a through follow up spidering after that.
Tends to repeat this pattern monthly. Very thorough spider. Frequent introduction of new IP Addresses for it's spiders. Will use non stock user agent. Not a decloaking hazard but be forewarned, appears responsive to user complaints for pages that violate it's spam guidelines.