Mistwell
Crusty Old Meatwad
No, but simply because I don't have them.
I started with Ray of Frost but the Slow Effect was seldom useful and so I traded it in for a Scorching Burst. Clouds of Dagger might be superior to my Magic Missile, but I am really happy with MM because I often got to use the increased range and I plan to get the bracers that increase the basic attacks. The last one that I have is Thunderwave and this is certainly the most useful at-will that I have. So I know that it is stupid that I didn't take on of your mentioned powers but I'm too happy about my current selection to swap any of these.
Anyway the extending duration feature should be quite good because I have an "Orb of Inevitable Continuance" that let me extend any power once per day and I used it to great effect with my Icy Rays (Immobilizing a strong melee monster out of range for two rounds rock!).![]()
Ah, well, no wonder you feel the orb is not very useful, given you cannot use half its powers!