I'm about 5.8 also and for me the risers were the difference between an uncomfortable feeling of being perched over the tank in a half lean and a very comfortable relaxed seating position. A huge comfort upgrade for me, at least. 2 inches back doesn't seem like much but it is, and the 1 inch up also allowed me to angle my bars down more for a vastly more comfortable wrist angle.
I also rerouted next to the triple tree at first with the risers and in a relatively short time the cable cover had started to look dinged. So I got a whole set of stainless look Barnett cables for the clutch and throttle. The throttle cables require no extra length (maybe something like 0.25 inches on the outside, but the stock length is fine; any longer and they curve out so far they start hitting the shield, I got a little longer and had to reroute them through the left cable guide on the triple tree rather than the right).
The clutch needs something like 2 inches more, maybe 1.5. You don't want too much there either or it will curve up way high also. First time for me switching cable lengths and it made me realize that the length has to be as exact as possible, and even a quarter inch off can be an issue.