I built,or had built my latest computer in 2011,IIRC it was Feb of that year.
I went and put an SSD of 120 gigs into it with a 1TB storage drive. I run the OS and AH on the SSD and thats pretty much all I do on this computer,I average about 15 hours per week in AH.
This is my real world test and so far I havent had a single issue with the SSD. It has about 40 to 50 gigs of data on it so far. Now I'm sure you tech guys could estimate the usage as I have no idea but it's coming close to 4 years now and I still have a year of warranty left on it if it should fail.
When I first got this system I had concerns do to the fact that many SSD were failing and Skuzzy suggested that AH would run just as well on a HD, so I made a backup of the game and my settings,etc. incase the SSD failed and decided to run AH on the SSD to see how long it would last before failure.
I would still recommend someone install a regular HD for storage,even though the prices of SSD's are coming down. That said I will likely only use an external HD on my next build!