Feature request for a product syntax segment. Basically when you fire multiple products in a single hit and those products have product syntax variables, you can't use them in segments. Any hit level segment captures the entire hit, not just the specific product syntax value you're looking for.
For example, if you have one order with three products (two new, one used) and each new item is $11 and the used is $6, let's assume you're setting the condition as a product syntax variable. For the first two the value is "new" and the third is "used". If you build a hit level segment where this variable equals "used", you'll see $28 instead of $6 since all three products were set in the same hit.