On my Loadmaster project I made a lot of parts and did some things not in the instructions to get it running like a top, the previous owner had given me a box of parts that had frustrated him. By the time I was done, it was the fastest Lee I have ever seen, load 100 rounds.
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On the other end of the spectrum, I have a couple Dillon SD's that only have Dillon parts on them and have loaded more than 100,000 rounds with them over the last 39 years.
Some presses require a little more trouble shooting experience than others that is for sure and Lee is probably at the top of the list but their equipment is also inexpensive, thus the allure.