So ever since my horse broke my original clippers last spring [can't remember the brand but they were ginormous and just all around bulky, loud and old

] I've been trying to find clippers to replace them, I bought 2 different clippers, cordless and with a cord, that my tack shop owner strongly suggested one from Oster and one from Wahl. Both have broken since then, the cordless wont keep a charge for longer then 10mins and the corded one just wont work half the time for some reason and when it does it doesn't clip the hair right [hard to explain]. I take good care of them but for one reason or another they just break. It's getting to be that time of the year again and I'm searching once again. What are some really nice clippers that you've had that have lasted?
ALSO; just thought of this, could the reason why the corded clippers broke/stopped working well be because of the thickness/coarseness of the hair? Last year I was showing a gelding that had thick/long really coarse facial hair.