For those who like tuning down their 6 strings but hate changing strings often, this set is for you. Long lasting sound, slick feel, and low cleaning maintainance make these a great set of strings. 
 
Pro: 
- Nanoweb coating keeps strings sounding fresh for at least 2-3 weeks 
- Doesn't rust, even with very acidic sweat 
- Set lasts for at least 3 months 
- Hardly ever breaks 
 
Con: 
- Good for tunings up until b standard, gets too sloppy after that 
- Uncoated strings can blacken 
 
In my personal experience, these strings are great for tunings between d standard and b standard. The only issue with b standard is that not all guitars will hold it well as the strings get a bit floppy at that point.