I agree with Mad Frosty's comment and yes we all know that Chris Birch is an expert when it comes to riding motorcycles and he is someone that has way more skills than me (but I don't want to ride at his speed, around corners that fast, jump crazy objects and wheel stand over rock boulders on an 1190 weighing over 220 kg's).
Back to risers! I have just finished a four day off road adventure taking me some places that were extremly challenging and required a high level of experience (and a good bike), to get to. After four days, I was not comfortable with having to bend over to reach the bars while standing on my pegs and my back suffered. I am six foot and the standard bars are just not set for my height and MOST important riding style.
Riding standing on your pegs is something I do very often, and my style might not be similar to Chris Birch, but I definitely need to raise my bars and will be ordering a set after I push send on this reply.
Oh, I highly recommend pivot pegs - wide, extremly comfortable expecially while standing up for extended periods and simply a fantastic product.
Hope this helps.