If they are anything like their chipping hammers, larger hammer drill, should be durable, or at least judging from those tools, which may or may not be a good way to determine if a another in their line is well built to provide long service life.
I had 2 laborers run 2 Hitachi chipping hammers about the same size as my old Hilti TE-52, for comparison, can't find a link or image of one, but its a larger hammer drill that takes SDS bits and small core bits, as well as chisel and wider scaling bits.
They prepped 9 floors 100x100 or so, concrete plank, after grout, for another final level coat, without any trouble, concrete cutting outfit used them exclusively, they worked well.
I would lean towards JD Sellers philosophy, buy the best you can afford, or the best you can eventually afford, save for, earn or what have you, never a bad investment, of course, take down serial numbers, photos of tags etc. and see if you can get what you have insured, buddy of mine just got robbed of 2K out of his company owned work van, next to his front steps, renters insurance only paid $500, he since pulled all his tools, set up his own van, leaves the company one in their yard, he had a lot of stuff too, years worth and some very recent upgrades, most of which they got, just a word of advice, those who work hard and have nice tools always attract thieves, forewarned is forearmed LOL !
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