I have a pair of S&W 3000's. One is blued with the folding stock, 18.5in bbl. with a front bead. The other is parkerized, also with a folding stock, 20in. bbl, rifle sights, and +2 extension.
The 18.5" model is my favorite; it's handy, light, responsive, and has a snap-on Hi-Viz red fiber-optic front sight. I love the folding stock (made by Choate; they also made the extended mag tube on my parkerized 3000), because it has a nice rubber shoulder pad. My parkerized 3000, by comparison, is heavier by virtue of the longer barrel and +2 extension.
These guns were the equals of the Remington 870's of the period, with the added benefit of Choate accessories pre-installed. The did have a significant flaw, though. If you remove the barrel and pull the forend forward too aggressively, you will bend (and destroy) one of the shell stops. RTFM, and avoid doing mishandling the gun, and it will last like an 870. Spare parts are scarce, though a company in Texas (Lone Star) still supports the guns with the remnants of S&W's parts inventory.