Finally had a chance to do a week or so of riding and commuting with Boogie's mid pegs so I can give some more input.
I'd say they are nice, but not a game-changer. It is nice having a different place to put your feet and you can lean forward and change where the pressure is on the old rump, but I really have to lean forward unnaturally far to change this angle. They do make it easier to tuck behind my small screen though when it gets cold though. The vibration coming through the pegs is a little annoying but that will probably depend a lot on the boots you are wearing - I have one pair the vibes come right through but another pair where I can feel it a lot less. Also, I'm 5'9" and a little scrunched up with my legs on the mid-pegs. This probably has more to do with my 275lbs than my 5'8" but if you are tall, I would think you would have a similar issue.
I've found my best results come from making a conscious effort to change my foot location from boards to mid-pegs every half hour or so instead of waiting to move until I feel numb or sore. If I wait until I can feel the pain it is too late and the new position does very little. I've also found that when on them I end up sitting back further in the saddle and my tailbone is sitting right above the seat mounting bolt causing unpleasant pressure (I swapped my pillion seat for a luggage rack). But I expeience this anyway on a long ride, the midpegs just seem to make me feel it more quickly.
Oh yeah, I also already somehow scrapped the ends off of them dragging through corners. Not totally sure how I managed to do that since I didn't consciouly ride hard with them deployed, must have been freeway interchange ramps or something. But I do have a (bad?) habit of scraping everything on the lower half of my bike on a regular basis. My pipes on the right side are almost worn through on one spot and my sidestand... well, it is more difficult to deploy these days
Your results may very.
