Well, after reaching maximum level of Trust with each of my attached Mims and keeping them fed, their effect on combat was a slight net positive. Both Sweating and Spit attacks has done more Lust damage to my enemies than Steele, plus occasional dodges and additional attacks are nice. I did find the wild size changes a tad bit ridiculous and annoying, but their aren't a deal breaker. Most importantly, the character that got them is a Spess Druid, so she can't possibly kill a whole bunch of helpless little critters, now can she?