It's a well known and published fact that you cant get something for nothing. I never said it will damage them (too subjective) but it will accelerate cell wear and as others have posted does not lead to a complete charge. Even simply storing these cells in above average temps will shorten their lives witch is why you are never suppose to leave them in the sun or a hot car. Now I know no OEM's like to admit it but these cells wear out on their own even if they have never been used after about 5 years or so...
I just decided to do some testing that shows a bit different behavior that I assumed I would see.
Fast charge enabled on USB to PC - 850ma charge rate.
Fast charge disabled on USB to PC - 450ma charge rate.
Fast charge enabled on wall adapter - 450ma charge rate.
Fast charge disabled on wall adapter - 450ma charge rate.
I checked the wall adapter I am using and it states it can output 850ma so I think no2chem's DLL only affects PC connections and does indeed exceed OEM suggested charge rates.
In the end no one can tell you what works best for yourself but it's better to at least have an idea of how these charges can affect things. Who knows how much it will affect things anyway - it could only shave a few weeks or a month off the cell's life.
Read over
http://www.batteryuniversity.com/parttwo-34.htm
"A moderate charge and discharge puts less stress on the battery, resulting in a longer cycle life."
"High charge levels and elevated temperatures hasten permanent capacity loss."