You asked for personal experiences, so here are some of mine. I don't use brass that I don't know anything about - for example the 100 rounds you bought from the range. Some of it may be once-fired and some of it may have been reloaded 10 times! You just don't know.
I also don't mix headstamps because there are subtle differences between manufacturers that complicate reloading. Some will have tight primer pockets and some will be loose. Some will have thin necks and some will be thick. Case capacities will vary causing differences in pressure. With light plinking loads those differences probably don't matter, but it is easier and safer to use good quality brass with a known history.
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