It looks like a superb "Serious" shotgun. The design is a classic, Ithaca has a great rep for quality, and there's gonna be lots of these sold in the near future.
A coupla caveats, tho...
One, the design does not lend itself to extended mags. This is a minor point.
Two, a bottom loading pump like this is a tad slower to reload under A/S conditions. This especially applies to one shot "Dry". An 870 that runs dry(I know it's not supposed to happen) can get one round off by just throwing it in the ejection port and racking closed. Can't do that with this.
Three, these are lightweight shotguns. This is both an advantage and not. Easier carrying, but more felt recoil.I've shot a couple of Deerslayers with the big Rottweil Brenneke, recoil was quite noticeable. A bit more weight would be nice for "Serious" roles. Is there a Side Saddle ammo holder that fits the 37? That'd fix a couple probs.
Four, it needs sling studs. For H/D, a sling's not needed, and may snag at absolutely the worst moment. Outside the house, that changes.
All in all, it's an excellent choice. I can't wait to see how the other makers respond....