I've had two.
1.) HK USP .45 tactical. Failed to feed and eject at least once every other mag. I was happy to have it fire a mag full without failing. Beautiful gun, accurate, but mine was a turd. My current USP .40 has been flawless.
2.) S&W M&P .40. I liked the feel of the thing, it was fairly accurate, good ergos, but it had the infamous mag drop issue of the early ones. It pissed me off. Even after smith sending me a couple mag catches, it still did it, so I sold it.
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