Panne is another that you really shouldn't waste your time on unless you really like her. She was power crept like, the day after her release and just never bounced back. She's not bad at all, just very... meh. There are better beast units out there. But I'd still recommend trying to get her, at least, simply because I love her so and feel like she's painfully underrated.
Yes, that would be so helpful! Though I'm not really obsessed with plus tennning any units, since I'm more of a casual player, anyway, so that stuff doesn't matter quite as much to me. But still.