I use these trings for rock, metal and jazz and love them. I've been using them for over 10 years and never experienced a problem.
For me personally, they sound the best after around a week of playing. I change them after 3-4 months. The sound is very clear in the beginning and gets warmer over time. I love the feeling too. I didn't had this clarity and durability of sound with other strings, they get dead faster.
There used to be red thread on both ends but now it's only one side. I guess they downgreaded aesthetics to lower the costs. Talking about price, before the Brexit, you could find these strings for way cheaper. That would be the only bad point!
Try them!