I use these on a guild m-20 and find them to be the longest lasting strings out of all I have tried (other Martin strings, Elixir, D'addario). They see heavy (very heavy) usage and I only have to rotate them every 2-3 weeks.
The sound is good and consistent, although maybe a little too bright on a less mellow guitar.

Tone match on my gigging acoustic guitar. I used to have Elixir or D'Addario but the Martin Guitar MA535T Authentic Treated string really exceed the performance on the other two.

It looks very good.
I use it for half a year.
Reliable.
Very convenient to place due to the length of the cable.

I've used these babies for 18+ years and never broke a string. Once I tried Elexir and on the first gig I broke a string. Recently I tried D'addario and broke two strings from two sets. Back to Martin.

Those strings are amazing for my Martin guitar. Also they last for ages with decent sound quality.