My experience with this plant has been pretty good overall but I noticed a couple of things. We're in zone 9 (Sunset garden zone 17) coastal Northern CA, so we have mild winters, warm dry summers with a good dose of fog and occasional periods of strong winds. We get 7-10 frost days on average per year.
First -- this plant literally sulked for a full two months after being planted from a quart can. I actually thought it was dead (being a newbie) and asked my gardener to pull it out. He checked the lower stems and said, no, it's still alive, give it another month and we'll see what happens.
Sure enough, suddenly it decided everything was OK and took off, blooming like crazy. It didn't stop blooming until the colder weather started, and even then had a few scattered flowers.
Both my plants got leaned on too heavily by shrub lantana planted next to them, and started to look a bit ratty. I cleaned out the brown stems underneath, cut it back a bit, and less than two months later (we've had a VERY mild winter this year with lots of 60-degree sunny days in 2003) it is recovering nicely and putting up lots of new growth.
Mine are in a planter box (so not a lot of soil medium) atop a south-facing retaining wall as I was advised they needed a lot of sun. Our summers will get up to about 75-degrees on average, 30-65% humidity. They get watered either once a week or once every two weeks depending on the weather, soil is allowed to dry out a bit. I'm erratic about feeding them but do sprinkle a slow-release fertilizer over the planter occasionally.
Hope this helps you! It's a really beautiful plant when it gets going.