Out Of Step Font Company
Works well. A few things:
1. no documentation explaining Discounted Pricing Method: Line by line discounts vs Single discount code.
2. For "Spend Amount - Get Discount", the product page bar should update when the cart crosses to the next price tier
3. Forces you to switch to a page cart. If you have been using ajax, and your theme forces customers to Cart page immediately upon Add to Cart, expect to have to redesign your cart page or Add to Cart functionality so as to encourage customers to continue shopping.
Shame you can't duplicate offers, to save retyping them out. And shame you can't select multiple products, instead of individually.
Goat Head Gear
So far so good, but discount not applied to cart. Still working on it.