I recently compared Jane Iredale Amazing Base and PurePressed, and I am absolutely impressed with Amazing Base loose powder. I've been a fan of PurePressed before, but the loose powder version absolutely takes the cake!
Second, AB stays the same on your face all day! I barely have to fix ups in the middle of the day. A very small amount covers well, it looks natural on the skin and does not break me out or cause cysts.
Note: Color is also very different. If you're switching between the two, Amazing Base tends to be about two shades darker than PurePressed.
Amazing Base application tips:
1) When you first put it on, you need to wait about 15 minutes to mix with your skin oils. If you're not patient with this step, then that can really mess up any other layers and touch ups you do.
2) Light application is a MUST - otherwise it will look cakey and heavy. You need only very little of mineral powder for adequate coverage.
3) USE THE RIGHT BRUSH. Can't stress this point highly enough. The powder will not pick up nor apply properly if you think you can use anything!
These are only basic must-do's to prevent a makeup disaster with Amazing Base. Getting it to work wonders on your particular skin will take a bit more work.