Well, your three main options with Moze are Boosted Health and Shields, the Nova in and out, and cooldown. Boosted health and shields keep you further away from Topped Off. Cooldown boosting will only be beneficial if you’re double longer bear runs or don’t have Grizzled.
I’d say it’s a nice way to drop some shields a bit so you can get to work on health. I have an Ember’s Blaze with NovaBear on it. Which, is just for my own giggles.
Probably best use of NovaBear Transformer would be if you plan on running in and dumping Auto Bear in the middle of a crowd. You go in. Nova. Shoot a couple shots. Then pull out nova.
I looked at someone’s estimate on shields and I’m not confident in their numbers enough to weigh any opinions based on them. Novas are really a “love em or leave em” thing.