Moderately stable (too tippy for my skiddish cat, though the brave one probably wouldn't have minded if he'd had the least bit of interest in it); Don't bother with the topper and seat cushion... it's like an oven mit and slides around. The sissel seems like a great fabric without being too harsh for delicate pads... but as it turns out, my cats won't scratch anything but cardboard or carpet. Who knows? I ended up selling this on craigslist. Good luck!