I was pretty locked in to Elixers until I found myself without a spare set, one day. I had just replaced the tuners on the GS-Mini and I went to my string drawer and,,, nothing there but a set of Martin M150's. I put them on the mini and was pretty impressed. They sounded great. I didn't think they would last, but they really stood up well for about 3 weeks. I usually get about 4-5 weeks from Elixers. The big difference is the price. I can buy 3 packs of the Martins for less than 1 set of Elixer's, and still have money left over for a beer at happy hour. I tried the Martin's on my 312 and they sound decent. Will probably stick with Elixers on it, but I think the Martins sound better on the mini.