I regularly buy HB strings in bulk because they are so much cheaper than any other brands. I use them on every instrument I own.
The main reason for getting these is obviously the price, and you know what, I feel like these are better quality strings than the price would suggest. I currently use these on all my guitars, and if you secretly replaced all the strings on them with different "big brand" strings, I wouldn't notice.
Now the one thing I noticed about these strings, and thats why I'm deducting a star from my feedback, is that when I put a fresh set of these on my guitars, they are sometimes sticky. Not sticky like jam, more like kinda plasticky. It does go away after about a day of playing though so it's not a big deal, but I still find it strange.
Tuning stability is good IF YOU STRETCH YOUR STRINGS PROPERLY.
Sound quality is also good, as I said earlier, I would not be able to tell these apart from other brands.
Overall, I recommend these strings.