I received this kit free with my Roland TD-4KX V-drum kit. I am overall very pleased with the quality of the accessory kit, and is good value for money even if not free.
The stool is very comfortable and portable, and it is easy to adjust the height on it. I do sometimes find that it creaks slightly when I rotate while sitting down but this is not a major problem.
The drum sticks are good, though not as strong as some other pairs you can buy from a music shop. I tend to use my other sticks for my V-drum kit personally, but these sticks are a good and light starting pair.
The headphones are of very good quality also, and they come with an adapter that lets you plug it into an amplifier or a V-Drum kit, which I found very useful.
I'd say the kick pedal is reasonable as well. It feels quite sturdy and of good build quality, though I often found it slipping from the bass pad of my V-drum kit. I also found personally that the spring has come off a few times, due to the nut loosening on the bottom of the pedal. Having said that, it is easy to readjust.
This is excellent value for money, especially if you purchase it with a drum kit where you can get this package for free. Would highly recommend.