Pretty Good

The user interface is pretty simple and pleasing to the eyes. some things to point out is that the pie graph does look off little, but thats my nit pick.

overall, i did test the "free memory" button and it did work and i checked other apps that displayed my memory and it looks like it was doing its job.
havent tried to "kill all apps" yet. there was a "do it on your own risk" so i wasnt sure if i should just to test the memory data.

One thing i noticed is that my space utilized and free are both little off. i did the readings on what itunes showed and compared that to the app.
nonetheless, I would use this app to help me free RAM and to see the inside workings of my iPhone 3GS

MrUtada about System Activity Monitor