Once you have your hands in the right starting point (using the `j` and `f` key cues) why do you need any more tactile help? Isn't the entire point of touch typing that your hands "know" where all the keys are?
Your hand eye coordination must be impeccable then. Especially on Mac keyboards, hitting the ctrl versus command key is difficult.
On the other hand my Apple keyboard is by far the keyboard I'm most comfortable using, the logitech illuminated keyboard coming second. I generally don't like all those ergonomic keyboards, they are all too bulky and take up too much space on your desk.
I love the Mac keyboards but those tiny fn, ctrl, alt, and cmd keys all right next to each other do cause errors.
I find most of my typos occur with my pinky. I think maybe it's just harder to hit those outer keys.