I have owned a LC9, and don't now. It was OK, but there are other guns I prefer...like the Shield. Minor annoyances were the magazine disconnect (which isn't easy to remove) and the LCI. The trigger wasn't bad, but it was long...it wasn't as heavy as the DA pull on most revolvers, to me.
This is my personal quirk, but the major reason I didn't care for the LC9 is that the procedure for taking out the firing pin (to clean out the channel) involves knocking out roll pins. I like to periodically clean out the firing pin or striker channel on my guns, and the LC9 has been known to have light strikes because of gunk in the channel. The slide on a Shield, for example, disassembles much easier.
Ruger is a great company, and some of their designs (like the polymer SR series) are very good guns, but the LC9 isn't one of their best, IMO. I have heard rumors that Ruger was going to redesign the LC9 to be striker-fired, which may (or may not) improve the trigger, and (hopefully) make it as easy to disassemble the slide as is their SR series pistols. They may not be, since the LCP and LC380 aren't, currently.