Since I seem to be the only Battle Mage here I thought I'd give an update to show how he's progressing, lvl 22 now! I think it indeed is viable and might even be superior to "normal" Destoyers as it looks so far.
Here's my lv 59 Destroyer!
Total time played is 14 hours
I know, it's not a very good shot, but I just thought it was a good action picture :P
I don't remember what level I was when I took it, but ... yeah ... anyway.