I picked up a Thunder Ranch last fall and I'm quite pleased with the shotgun. In some ways, it is classic Mossberg, as it does rattle a bit and it just doesn't feel as tight as a Remington.
However, this thing works! The shortened stock, combined with the shortened barrel, make this a great shotgun for home defense. I would not recommend clearing rooms, but if you needed to do so, the length of the gun would make it idea for doing so. The addition of rails and the sight are great. I had thought I'd prefer ghost rings like some of the 590A1's have, but after using this little beast, I don't think it is necessary.
The breacher is a bit of a turn-off for some, but having a pointy end to poke with isn't a bad idea, honestly. The barrel is quite sharp and you could do a bit of damage with it if necessary.
Overall, I was a bit skeptical about this gun until I picked it up and now I really love it. Great design, great gun and my biggest complaint is the name on the side. Otherwise, I would recommend it!