It is a good deal - I'd say - though it's not SPECTACULAR, it's good. You can buy the same tablet on Amazon for $50.00 each with advertising - or $64 (I believe it was) without advertising. I am not sure whether the HSN deal has advertising or not. Advertising just means when the lock screen is up, instead of a pretty photo, you get some sort of advertisement. It's really not that big of a deal in my opinion, but the ads might bother some people. They aren't popping up when you reading or anything, it's just on the lock screen.
The one on amazon however, does not include the case - so that's kind of the bonus. The custom cases for this tablet on amazon run $24. They are not the same exact case, but similar I suppose. So you're basically getting free cases, since it costs the same as the advertisement version on amazon. I wouldn't count the memberships they are "including" as any kind of real bonus as they are only temporary and not that useful anyway.
The kindle itself is a great tablet - this one is really good since you can expand the memory up to 128 gigs with an sd card! I own multiple kindles at home, they are great for adults or kids, and you can do about anything on them. I use mine mostly for reading and watching movies/shows. I don't really like typing on them, but you can browse the internet and type if you want to use it that way as well. You can download apps like facebook or other games. It's a great all around tablet and kindle does them well at a very good price.