If you're using the length for leverage, you WILL break them.
If you're using the length in order to reach the previously unreachable, you'll probably be fine.
Many, many people who buy this style of wrench do not understand this distinction and ***** and ***** and ***** and ***** when they predictably break their expensive wrenches. You usually have to break the fastener free in some other way before employing the ratcheting wrench.
FWIW, Northern Tool if there's one nearby has this style of wrench on the shelf in singles. It might be worth buying one in a size you use a lot to see how you like it.
A while back, Tekton sold a very nice 3/8" drive ratchet with an extra-long handle. Very useful in many situations, but in much the same way, quite a few buyers failed to understand the basic physics involved and the proper uses for such a tool, and twisted the square drive right off. No matter how good the steel is, there is a limit.
And yeah, Mountain essentially has no warranty, and there's some percentage of DOA wrenches, so caveat emptor. I have a limited tool budget, so I took a slight gamble on Mountain wrenches from Amazon, tested them all when they arrived, use them within their limits, and they've been great. But I don't even remember the last time I broke a tool; I'm just not that sort of mechanic.
If you regularly break stuff, then look inward and consider your options.