I have had a CFL in my range hood for 3 plus years. Zero issues with it and I have yet (knocking on wood) to have to replace it. CFL's are a crapshoot. GE and Phillips are now manufactured in China, I believe. The quality control from anything in China is suspect, at best. My experience with those brands is more on the disappointing side. However, at the box stores they are the brand that usually has the cheap multi-packs for sale. One might get lucky with them and have an attrition rate that is acceptable.
I have not purchased a CFL in quite some time. All of the ones I currently have are at least 3 years old. From what I hear Sylvania has the best quality, along with the highest pricing. So, choosing brand is your only concern. My friend is switching out to LED's, and I am quite surprised on how bright they are.
As for mercury? Worrying about one breaking is rather pointless. I have never heard of a lamp breaking on its own, and unless you are doing Ginsu maneuvers on the stove, concerns are minimal. Not to diminish the threat, but trace mercury exposure from a CFL seems a bit harmless. Repetitive exposure is what will give you heavy metal poisoning, not a one time trace amount.
Clean up of the problem, if it happens, is rather easy. "Proper" disposal is something else. Unless you keep the light on 24/7, just use a regular lamp or get a small, encased under cabinet fixture. Those lamps are cheap and if they burn out, replace.