Totally worth the cost in terms of tone and feel. I prefer light gauge for bending and bluesy playing. The Silked Phosphor Bronze sounds great for solos as well as for rhythm playing. I've used them for 10 weeks now and it began to rust around 6-7 weeks in (I play quite a lot, and I sweat easily - so it makes sense). Writing this review as I'm buying my 2nd pack now. These are easily my new favourite acoustic strings!
PS: You don't need a martin guitar to use and benefit from these.. I'm using these on my Kadence Frontier 39" Acoustic Guitar.