Here's a summary of the bad points I've read about the Wacom Intuos5 (all of this is just what i've read, not my own experience, but I'm picky so I trust other picky ppl for now lol )
*it's surface is still rough and still a nib eating monster
*the touch controls are laggy and mostly a hackish work around in photoshop and painter (zoom in is just repeatedly sending CTRL+)
*the buttons are harder to press down
*there is no overlay sheet for the touch models, you scratch it, you have to send it in for repair
So atm, I'm gonna go a hunting for a replacement overlay for my Intuous2, and something suitable to use as a nib. LOL, I've used toothpicks in the past, even tried a smoothed down nail with some cardstock over the surface once and actually drew with it. Weedwacker cord is another I've heard about, but it might be too twisty, who knows XD But I'll continue working on art and hopefully be able to snag myself a new monitor soon enough. Here's one that I got my eye on currently. It's expensive for it's size, but there should be no color shifting going on like most LCD's. Mine is just terrible atm. With a fully black screen, I can see brown on the left and right edges.
Also had some ideas today about implementing some kind of OSD for drawing straight 90 degree lines in SAI, and other angles. It would be an exe that runs alongside SAI and helps you draw a line when you hold a certain key. It would have adjustable angles too. Like not like 90 or 45 but maybe as many increments as you need. It would work like so: you hold a click your stylus down, hold a key and drag outward from there. It will create a line from that point to your mouse, but it will also move that line while you move your mouse around, a lot like the line tool in vector mode. When you release the key, it will draw a line from the origin point to the point where your mouse was.
Currently, to make straight 90 degree lines in SAI, I have to line it up with the edge of the canvas, or drag out a really small rectangle with the rectangle selection tool and fill it with a color. To make 45 I'd have to use incremental rotate keys with the canvas, then make a line that's lined up with the edge of my screen. A real pain in the tail eh?
Or maybe I should just shut my muzzle and use Manga Studio for perspective and lines lol ^////^