I've never bought a new-in-the-box 870 in 40 years of shooting them, but if y'all keep this up you're gonna make me go and do it just to see how good the new current production Express guns really are. There's no way to know save to run one through its paces. I think a lot of the Express gun woo-woo on the WebZ is just the usual everybody-says-it stuff, but it's hard to tell just what the product is like without owning one and living with it for a while. And even then a one gun sample isn't much of a deep statistical pool to dive into, but it's something.
With shotguns and most other tools in life, I've always operated on the principle that I'm buying it not marrying it. IOW, if I don't like it or if I break it or whatever, there's always another one to be bought. And if it works and lasts and I like it, I can pick up a spare or three just to be on the safe side. Things DO wear out and DO break sometimes, it's just a fact of mechanical life, and buying the finest whatever that there is, is no guarantee that it might not go down at some point. Mechanical stuff breaks. Murphy loves you. That's life. Get on with it.
I understand the anticipation of buying something new, I've been there and for some things I still get that old kid in the candy store feeling. If I didn't ever feel that way any more, I guess it would be a good time to just curl up in a ball and die. But an 870 Express gun is a pretty utilitarian purchase, as I see it. It's like buying a good hammer at the hardware store.
I'm a little ashamed to confess that at this point I just couldn't tell you how many 870s I have, there are 870s of mine in different quantities in four different houses in three different states, and over the years I've just lost track of how many there are, all added up. Most of them by far are older Express guns bought used for $150 or less. I've always said I'd rather have another good shotgun in the safe than $150 in depreciating dollars the bank. I still say that, and I'll still buy any good cheap used 870 I come across.
So all I can say is that I can't see any reason not to buy a new 870HD, or even that fancy new Italian movie star/870 cross they got out now, and shoot the snot out of it and see how it works and how you like it. I know how modular an 870 is and how many accessories there are for it out there, and how it's possible to turn a basic 870 into almost anything you want it to be. But even so, it's best IMHO to start with a plain jane riot gun if you want it for a defensive shotgun, learn to run it safely and efficiently, get some good training on how how to take it into a gunfight if you have to, and go from there.
fwiw,
lpl