My Wolf Companion is getting more kills than the new Owlbear. That does not happen with any of the other epic fighter hirelings.
The Owlbear attack speeds is ridiculously slow.
I also tested the level 25 Owlbear out in Gianthold. It took him like 5 minutes to kill 2 giants. This is with me healing him. (with druid buffs, augment summoning, and druid past life)
I don't even want to think about how much this hireling would suck without the druid and summoning buffs.