My problems when I lowered mine was it chewed through tires way too fast and my lower ball joints needed replaced multiple times. It was my only car so I had to drive it everyday. If I had an alternate car to drive it wouldn't have been an issue but I got tired of replacing tires and ball joints.
I have an 04 (180K+) and an 06 (140K+), and both have been very reliable, at least as reliable as any other cars that I have had. I purchased both new, and I can compare them to two Grand Marquis purchased new, one 73 Mercury Monterey purchased new, two used Grand Marquis, one used T-bird, One used Ranger, One used 325i, one used LTD, one purchased new F150, one used Plymouth Volare (huge mistake), one used Mirage (big mistake), ...