My current army is 10 giants, 14 wizards, 6 Valkyries, 10 barbs, 20 archers and 8 wallbreakers. (I basically use them as tanks, destroy surrounding buildings and send them into the base. Their high health makes them great tanks and they do pretty good damage.
However, a change is needed as they are way too expensive to train (possibly 50 DE instead?) and take too long as well (8 mins would be much better). Apart from that their stats are pretty well balanced but maybe their splash should have a bigger radius as it does nothing against buildings.

