The Radion from C.A.M.P. is the most advanced ice screw available. A unique hanger rotates independently on the shaft, ensuring the force of a fall is applied at the optimal angle. The Radion features a reverse angle on the threads (flat side towards the ice), to distribute pressure more uniformly in brittle ice.
If you're doing long straight pitches of pure water ice, these are the way to go. Long ice pitches require speed and efficiency. These save the time to clip a quickdraw, as well as the extra fiddling and the extra weight of carrying an extra draw. If you want, you can clip the rope before you start the screw to prevent dropping and losing it, though it makes starting it harder. The extra security while the screw is going in is pretty nice as well. I like the way they rack, just hanging down off a gear loop like a cam would rack. Its easier to get off my harness like this than it is to get a screw off a caritool/ice clipper. It also frees up space on the clippers for other screws that I would use with an alpine draw or build an anchor with. They are kind of jangly and snaggy hanging like that, but its still better than any other method.
Basically for me, these are perfect for protection on long straight ice pitches. They aren't ideal for anchors, wandery alpine pitches, or anything you're going to want a longer draw on (though they will work just fine). In that case, use Grivel Helix or 360s.
These screws are rock solid. They are incredibly fast to place. They are super easy to "start" and then they sink into the ice like a drill. In my experience they are easier to place then BD turbo express. Now, the sling: Ok it's great in a way, and also quite limiting in a way. It's nice (at least psychologically) to be able to clip in after just two rounds of turning and it's nice to save a carabiner. On the other hand if you want to use a long sling you either have to clip a carabiner to a carabiner (!) or plan it in advance and rack it with the long sling attached two one of the two clipping points. They are quite tricky to rack as well.
So, these screws are great, especially in combination with others, but I would not recommend a rack consisting of only these.