I am working hard to use the MT with photoshop.
First, its lack of pressure sensitivity, as compared to the Wacom tablet, made it a non-starter. As much as I hated working PS with a mouse, which reminded me of drawing with a potato while wearing oven mitts, the trackpad is even worse. There is almost no difference between its implementation and the built-in mackbook pro trackpad. Both fail.
Next part of the experiment was to re-gain some of that pressure sensitivity.
I purchased a Pogo stylus and their inklet app and gave that combo a spin with the MT.
The tip of the Pogo is about the size of a pea, and it is covered with a fuzzy material to prevent scratching the surface of iPads and iPhones. The inklet app operates as an assistive device which must be enabled in system preferences
Much of the utility of the tablet is restored with this combination, however I have some reservations. Note that I am using a pair of 30 inch displays, with a wide gamut display in use for photo editing and a Apple 30 inch display to support palettes and other information I might wish to display while editing.
The good:
Pressure sensitivity is restored. I can vary the size and/or opacity of a brush by varying pressure which I consider essential for fine quality photo editing.
Although the size of the active surface is much smaller than the active surface of the Large Intuos 4, even when the active area is mapped to span both displays, there was enough lateral precision to be useful. Greater precision is available using the inklet app by constraining the mapped are to be a selectable portion of the display. This may be useful for some, but it then is unwieldy to also use the MT+inklet+Pogo for menu tool or palette operations. This is partially offset since inklet can be temporarily disabled by pressing the "~" key. The problem with this, of course is that the keyboard is essentially disabled since it is busy being used along with your spare hand to hold down the "~" key.
I was also pleased that the brush re-sizing feature of CS5 was fully functional
The Bad:
A feature of the Wacom Intuos 4 tablet is that it can sense the pen position while it hovers over the surface without actually making contact. This enables its driver to differentiate between a positioning attempt and a "click" which occurs when the pen tip makes contact. The MT+inklet+Pogo does not have this capability, so that a bit of surface contact is required to detect its position.
Although "Multi-touch" i a feature of the MT, it i really an issue should you happen to lightly drag a little finger while drawing. inklet at least in this revision cannot tell apart a finger from the stylus so the position would jump around. This is an area where the combo seems to operate a bit differently on the mackbook pro touchpad and the MT where stray finger detection seems to be a little better.
The Ugly:
The tip of the stylus is the size of a small pea, so the point of contact is a bit ambiguous. The driver does a good job stabilizing this and determining a steady point while the tip is touching the surface of the MT. The issue with this ambiguity is with initial contact. o matter how hard I tried, if the stylus were raised and lowered on the surface several times, each time, the detected position would be a bit different unlike the Intuos which was dead-on each time. This is not a problem for casual retouch, but it slows you way down since position confirmation needed to bee seen on-screen each time. This might have been aggravated by my mapping of the MT surface to span two 30 inch displays.
A fingertip was detected as was the tip of the stylus, however fingertip use produced a very jittery response, almost too jittery to turn off the inklet app in its menu which took several tries.
The MT clicks when its little feet detect enough pressure. Although the inklet app could detect and reject the palm-contact, when a click occurred it was a click even if not wanted. Be careful to not allow the hand to exert any pressure on the MT while using the stylus.
There is no pen tilt detection. I use this occasionally in PS to add controllable jitter which is useful when drawing eyelashes and adding foliage.
Bottom line:
This combo is going into my drawer of curiosities for now, at least until there is another revision of the inlet driver. I may continue to use the MT as a mouse; it sits on top of my Wacom for now and is removed when I am using the pen. I still need to gain more facile use of it however, which might occur in time. On the balance, the MT seems useful enough for now but a week or two will tell the tale. I prefer it to the wacom mouse but not to the magic mouse, but the magic mouse has its own problems since it makes a very annoying scraping noise when the wacom is used as a mouse pad. In a while I will let you know if it also ends up in my drawer of curiosities.
-bob