Marathon plus are great tyres and work well but of course they are not the answer for example a couple of weeks ago i had a massive thorn in my tyre
which coarse me to have a flat it was about a inch long the angle it went in
it coarse me to have a flat straight away
Lucky enough i had sealant in the tube to save me from taken the tyre off and putting a patch on a quick blast with the co2 cartridge and back on the road again got me home with no further problems
Depending on the rim some marathon tyres can be very hard to get on the rim and it nearly impossible to get them on the rim i did have the delightful experience of this about a month ago when i was installing winter marathon tyres to get me through the ice spell
i got that fed up of installing the marathon winter tyres on my rim i bought something could a Cyclo Tyre Lever which is made for a workshop environment but i would recommend it for a home use to make getting on and off tyres a breeze with very little effort
i have thrown all my other small tyre levers in the bin because nothing come close to using this tool
https://www.amazon.co.uk/Cyclo-Tyre-Removal-Fitting-Tool-x/dp/B0050VDUBK