I have Apple Jacks on the way, and I honestly can't wait to test it out as I used to pour
through boxes of it when I was younger (and I'm in the mood for some right now oddly enough)! I'm going to be doing some testing on their more "basic" flavors in the next few days to week as well to see how well they stack up, so I'll make sure to report back with the details.
For those that may not have head back from them regarding a free sample request, it looks like this
thread has generated a little extra business for them and they've been a little busy, so if you've not heard back from them regarding your sample order, he said please be patient. Just forwarding some info over so no-one feels left out. Free is in high demand regardless of company

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As for the Rice Krispies Treat I was working on, so far it's an ADV and I'm loving it with the Bavarian Creme. I think that and TFA's Marshmallow really blend well together and negates the need for a butter flavoring. That said, I don't have butter on-hand, so I can't do a side by side comparison. Maybe soon though!