For most mixes I've been using Purilum anywhere from 1-6%. So yes, very similar to TPA, CAP, etc. The thing I've been so impressed with its how accurate some of these flavors are. They're definitely good for beginners because they're easy to work with since they're not stupid strong (a little extra probably won't kill a mix like stronger brands can do) and the price point is very reasonable.
Here's a rough estimate of %s that I'd use in mixes for the ones I listed in that other post:
2-4%Cranberry orange ( bright tangy and tart cranberry sauce with orange notes)
1-5%-Strawberry marshmallow cereal ( think lucky charms cereal but with strawberry flavored crunchy marshmallows)
3-5%-Lemonade and strawberry lemonade ( these are just really nice smooth lemonades)
1-3%-Cookie (crispy crunchy homemade sugar cookie, works great for adding a crumbly layer to desserts)