I'd like to assume federal has done pretty extensive testing on it. There's a lot of influencers who got a bunch of early ones to test (test dummies) to try out. I haven't heard any problems as of yet, not to say there might not be.
Steel is stronger than brass in every way. I'll be an early adopter and share my findings. I'm excited to reload it. Stretch is minimal and doesn't require trimming, primer pockets won't enlarge like brass. I wonder what the # of reloads is before you need to toss it due to neck/shoulder wear.
From a scrutinizing point of view, other than being new, what are you apprehensive about? Just curious what you don't like about it.