I've been using 4198 since I picked up a .223 earlier this year. Been happy with it. If economy is important to you, you will like this powder. Mid range loads for this powder will give you about 350 rounds per lb. Most other powders are under 300 per lb. I don't use it just because it is cheaper, but it is an extra bonus. Costs about $2 less per 100 rounds vs CFE 223.
The only other powder I have used is about 20 loaded with 4895. When I started loading for 223 there was nothing available locally. When some 4198 showed up I grabbed a couple bottles. There are several options available on the shelf now.
We are paying $40 - $50 per K for primers here.