UPDATE: Additional testing of the Flip has surfaced a much more serious issue than pen pressure or fan noise. I must recommend that you avoid the device until the issue is corrected. See this post for more information: http://surfaceproartist.com/blog/2013/11/14/the-real-dealbreaker-for-sony-vaio-flip-15a-frequent-loss-of-pen-touch-control
And in case you're interested, Autodesk Sketchbook Pro 6.0.4 runs well and with pressure sensitivity.
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I had the chance to install two additional applications on the Sony VAIO Flip 15 A this afternoon and I'm sorry to report that neither program runs perfectly.
Paint Tool SAI
It doesn't really surprise me that pen pressure in Systemax's Paint Tool SAI v1.1 doesn't work. This version was released in 2008.
I must thanks Twitter follower Dave Barrack (@grrlpowercomic) who explained that pressure sensitivity in SAI is set on a per brush basis under Advanced Settings, Hard <-> Soft.
Unfortunately, no value from 0 to 200 yields a pressure sensitive brush stroke.
The program doesn't have multi-touch support either, so it's not possible to pan or zoom with one's fingers. Though palm rejection works for the most part, it's still possible to create stray marks with one's pinky or knuckle even though the pen is also in the screen's proximity.
There supposedly are more recent beta versions of SAI available for download, but I was unable to find them.
The SAI interface is also not ideal for a tablet. Even on the Flip's ample 15.5 inch screen, touch targets are very small and need to be selected with the pen tip.
UPDATE: Thanks to Twitter follower Yenny (@Nashoki44), I found the latest beta download for SAI 1.2b5. Unfortunately, that version did not correct the lack of pen pressure.
Although the latest update of Ambient Design's ArtRage 4 recognizes pressure and supports multi-touch with the N-Trig digitizer, I was disappointed to learn that it's still possible to create errant marks as you draw.
If you need proof positive that pc manufacturers haven't a clue, look no further than Sony's decision to bundle ArtRage 3.5.5 Studio with each Flip sold in the U.S.
I'm sure that retailers display that program when potential buyers ask about paint capability and I'm equally certain that savvy buyers will quickly cross the Flip off their lists based on its buggy performance. Any finger gesture may result in unwanted drawing and sometimes in the middle of a two finger zoom or even a pen drawing, unwanted lines will start shooting across the screen.
ArtRage 4 has been out at least since the beginning of this year and it has far fewer issues. Why Sony chose to package the older version baffles me.
If you can keep your pinky or knuckle from tapping on the screen as you draw, you'll be very happy with the results. Otherwise, you'll need to stay vigilant and frequently use Undo.