Do apps that claim to increase SD card performance really work? Strain on card?
Here's the original XDA thread.

Basically, it shows a fairly significant improvement for some devices.  2048 kB might not be the best setting for your particular device, so you might want to experiment.  I'm running it on my device and noticed a minor improvement; it certainly wasn't harmful.  I'm not 100% sure but I would think it would not increase wear.