And the forward pegs are very handy for just changing your position when on the bike for extended periods of time..
Full disclosure: I have HT PD nerfs/engine guard/highway pegs/bash plate installed on my '07 KLR650.
Weight, on this 400-pound rig, is of no further consequence, IMHO.
While I've been no particular fan of highway pegs, because in my view use of these pegs limits vigilance and delays response time to the controls, after a 3-day ride of the southern Appalahians through parts of NC/TN/GA, I must conclude: THEY HAVE THEIR PLACE!
Specifically, highway pegs can relieve leg cramping on long trips. One can't actuate foot controls at all, if those lower extremities are PARALYZED from cramps or having, "gone to sleep."
So, for long-distance touring, I shall not knock highway pegs.
BTW, if you're installing HT nerfs on a pre-'08, put the upper left nerf's bolt through from the RIGHT side of the frame; then, you can access the radiator cap by simply removing one 10 mm nut and hinging the nerf away (rather than removing the entire bolt and having to spear the hole upon reassembly.)
Guess where we are:
Some bikes on the ride; "Bikezilla," 1800 cc V-Twin Honda at left; proud and valiant KLR650 in center: