Great review!
I've had the Artemis P15 for a while now, and out of all of my [more expensive] PCPs, it was The Most Fun.
I shoot before and after work every single day - 10m indoor range at my place, and I'll say this..
Mine absolutely loves Crosman Premier 14.3 grain HPs for short range. Pellet on pellet action all day..
For longer distances / windy conditions, JSB 18s and H&N 21s work Great. [I have Hades - just haven't tested]
The weakest link - The factory magazines. Yuck. I ordered 2 extras when I got mine. And it was a good thing..
Only 2 - Sometimes 3 of the 4 work properly.
ddark / Darko makes some really nice upgraded magazines for these rifles, and they're Highly Recommended!
[people can search for him or his mags online, or, search for and contact him on here]
One thing to keep in mind though, and this is an important one..
With the SPA / Artemis P15s, they can be a real gamble.. Apparenty this is very well known..
Their barrels are Not all created equal. Some [like mine] can be just amazing..
On the other hand, others can be real turds. Not uniform, rough / tight spots, burs, crown issues, etc.
Slapping a different stock on these rifles does nothing about the overall performance,
and from what several people have told me [who have gotten the Diana version] They weren't so lucky..
Their SkyHawks had to either be returned, or, they had to spend even more time/money upgrading the barrels..
I can 'almost' understand that IF going with the original - for the price..
But in all reality, I just can't justify Diana putting these out there all dressed-up w/ the fancy stocks
and not actually addressing the known quality control issues. It may be claimed they do, but others disagree..
[I'm staying out of that argument. haha]
In the end, it all boils down to someone's preference, pocket-depth, and luck.. Still Highly Recommended either way!

Sam -