Never owned one.
HOWEVER.
But more than a few rounds through both a Lionheart and the OG Daewoo it comes from.
Things I liked:
pretty good trigger
Heeeeey 3rd gen smith magazines! Awesome!
Looks good
"Triple action" is...weird but nice.
Things I didn't like:
The Styling of the lionheart vs the 'woo. Just thought the K5 looked cleaner
The size of the safety. Woof. It is small, and the pivot is in the front making it feel a little "wrong" from the manual of arms I'm used to. (1911/cz/etc) Still better than a slide mounted, though!
Anyway, they're cool, they work, I don't hate them. If you like a 3rd gen smith (and I do) and hate slide mounted safeties (which I also do) then it's a great gun. If it were me I'd hunt for a surplus K5, they're around and not very expensive compared to the LH9 and are, you know, the same gun.