I have them on my 17 abs. They raise the bars 1" and move them back a bit as well for a more upright riding position. They can also be used to lower the front of the bike 1" but that negates the riding position change.
Minor tweaks are needed to cable management. Some people haven't needed.to do a thing. I had to bend the loop on the right side of the frame a little for clutch cable clearance and my brake hose is a little snug at full left lock.
It was a great upgrade for me and made the bike much more comfortable (I didn't lower the front. I also lowered the rear 1" which helped as well.
Install takes anywhere from a few minutes to maybe 30 depending on skill level. You'll want to have a torque wrench as the torque of handlebar bolts isn't really something you want to guess on.
As Kennylxix knows, I pondered over this same subject for weeks and many postings. Finally decided to do the installation on my 2017 KRT ABS.
Some folks stated that on the ABS bikes, some of the cables may need to be moved and a loop bracket slightly bent. But, I did install the risers with no problems and nothing needed to be realigned.
I also pondered over lowering the rear 1 ", but once again I went ahead with the installation of the 1" lowering links.
With the risers and the lowering links, it does make for a somewhat more comfortable riding position. And most people familiar with the 300, probably would not even notice the mods.
Personally, I would do the risers.
And perhaps you should also consider the rear lowering links.
Their are quite a few manufacturers of the lowering links and some will adjust from about 1" to 5 ". But I opted for the links that were made to lower the rear just 1 ". Once you lower more than 1 ", you will have to consider a new adjustable kick stand and I did not want that. I was able to keep the factory kick stand and the bike still parks perfectly with no chance of falling over.