I thought they were a little too slow but I am still using the vanilla ones. I like most of the spells except for the frost ones, I like using spells that have a wide damage radius.
Area of Effect spells -- love them. I'm assuming they have those in Oblivion (or at least I'm hoping they do). I haven't seen them yet, however my caster isn't a very high level. And I'm gonna make another character once I reformat my computer, and start from scratch, not fast-traveling anywhere unless I feel I TRULY need to. Anyway, that was a strange tangent, and I'm done babbling now.
the frost spell could do with being abit bigger but other than that I think it looks alright the fire ball spells are good as well. I dont like the heal one's I mean early on okay fair enough they wouldn't look that good but I think the more powerful ones should have more effects.