I actually started converting to CFLs about 5 years ago.. bought about 20 bulbs when I found a good price on them and replaced any incandescent I could with them. The main issue I found when installing them is they didn't fit half the light fixtures due to their size. I bought a pack of mini's after that and was able to convert a few more fixtures over. Wasn't too fond of the delay in turn-on time and the color, but hey I was saving some money on electricity..
Then a few years in I had a CFL fail. Horribly. They have internal "electronic ballasts" -- see the link here http://www.eetimes.com/document.asp?doc_id=1272528
I had one that smoked while I was in the room. Smelled bad like burnt electronics, the base of the bulb was all burnt. I did some research and found this is expected behavior for a failure. Here's another link that goes deeper into the topic of burning melting plastic being normal failure mode -- http://sound.westhost.com/articles/incandescent.htm
Now I guess it's my fault for not researching this more before buying them, but CFLs were supposed to be this great new technology and save everyone a lot in energy costs.. so why question it? I've had ballasts go in larger florescent light fixtures, but hadn't really thought about how a CFL was designed and that it had a mini ballast in it. It just seems like a *really* horrible design to have something that gets so hot be using capacitors in the electronic ballast at the base which is going to see a large amount of heat, especially in a fixture that isn't allowing the bulb complete airflow. It also seems really really bad to say that melty burnt plastic is "normal" for a failure.. look at some pictures online and there are some *really* bad looking failures with these bulbs. I'd rather not be one of the unlucky ones that has an untypical failure resulting in a fire.
Since my first CFL failure I had one more go in the same way. These bulbs weren't even used for all that many hours. After that, I decided screw it and went back to incandescents (up until recently). Now that LED bulb prices have come down to under $10 for many wattages, I started converting over to LED. Much safer IMO as it's not generating as much heat to fry the electronics in the bulb. That said, some LED bulbs do still get hot at the base (I tried a few non-name brands that got quite hot).. and I wouldn't doubt there are some design flaws with certain models. It's also unknown exactly how long these will last based on effects of heat, but I'll take my chances over CFLs