I ran Marathon Pluses for over a year - they're fantastic if your main criterion is 'doesn't get punctures ever ever'. However they're probably twice the weight of any other tyre you can find to fit 13mm rims - and you'll feel it, particularly pulling away from a standstill.
I switched to Durano Pluses about a year ago, and the weight difference was incredible. I haven't had a single puncture with them either, and although they're still not the quickest tyres I've had, I think never puncturing makes up for it. Not strictly relevant as not a fat tyre.
I ran Marathon Pluses for over a year - they're fantastic if your main criterion is 'doesn't get punctures ever ever'. However they're probably twice the weight of any other tyre you can find to fit 13mm rims - and you'll feel it, particularly pulling away from a standstill.
I switched to Durano Pluses about a year ago, and the weight difference was incredible. I haven't had a single puncture with them either, and although they're still not the quickest tyres I've had, I think never puncturing makes up for it. Not strictly relevant as not a fat tyre.