I have had both:
1) the "highway pegs" that mount up high on the crash bars, are rigid.
............ and will put you in the hospital if you ever do a highside...... Ask Gene Lester and Dave Ogden about that exercise......
2) on my 1800, I made it a point to stay far, far away from Rigid mounted highway pegs,
I bought the Mick-O-Pegs and 3 months after the check cleared the bank, I forgot how much they cost, and love them immensely.
if your foot is down, and you go into a tight twisty, you feel your heel start to drag just a tiny bit, and you lift your foot off the peg, it springs way up high out of the way.
here are a couple of pix of how I mounted mine.
I used two 12" Crescents to put a twist in the long arm ( recommended by Mick himself )
so that the peg is angled upwards about 30*
what that does, is create a "saddle" for you foot/boot to sink down into and there is no way that you will ever have a foot slide off the pegs and hit the ground and break an ankle.
Look closely at those pix, the pegs tuck into the bike so tight, they are near invisible.