I was looking to replace my Raptor 350 shocks with these:
15 3 4" 400mm Air Shocks Absorbers Yamaha YFZ 450 Raptor 700 660 Banshee I SK15 | eBay
Any ideas how they are?

 

Well, first off is they are just a traditional shock and spring, not truely an air shock. I have never heard of that brand which makes me suspicious it is knockoff type stuff. If you buy them, I wouldn't chuck the stockers anytime soon.

 

IMO, junk. They claim air shock. They use nitrogen not air. They make it sound like you pull out the tire pump and give it a pump or 2. They do say "air (nitrogen)".
12 years ago I paid $1000. for my 2 PEP ZPS front shocks so I'd say for $100, you won't get much.

 

We rebuilt and recharged high $ nitrogen shocks at the shop and at this price for a set of new shocks(100 bucks) buyer beware. You might want to read this article.Rebuilding RFY Cheap Shocks

 

After reading that article, just go with some Works steelers and be done with it.

 

ditto