The amount of PSI you set it to before forgetting it also depends on the style of beer it is, and how you like it. There's a chart somewhere that shows the PSI to set it to at the appropriate temp of your fridge to dissolve the correct amount for the style.
For my first, I had a Pale Ale and set it to the amount as set out in the chart for the Pale Ale and waited a week, but I thought it seemed a little low, so I upped it a PSI or two and liked the result a few days later.
As far as aging goes, I haven't noticed any in keg aging with mine, but I filter so any remaining yeast are gone from my beer and thus aging would have to be attributable to something else and would probably be more muted.