The springs are fine, there's not much to say about them. I do wish the hooks were more acutely angled - I feel like the straight 90 degrees could be at risk of slipping out of the hole while the bridge is under tension.
That said, check that your bridge actually has extra holes if you're planning on adding more springs to it! I bought these to add more tension to a Harley Benton strat-style guitar that I strung up with 11-52s, but when i took off the backplate I realised they only drilled holes for 3 trem springs! Thankfully I had a drill and some patience so I could install all 5 like I wanted to, but keep this in mind.