Brent's Buckhorn bars are the same dimensions as the ones I have on my bike. I know, because he asked me to measure mine.
You will need more "oomph" moving about when parking because you lose the leverage of the wider stock bars, but on the road you shouldn't notice any difference.
Some things you may encounter - the different geometry of the bars may put your front brake reservoir at an angle, front to back. It will still work, but it will hold less fluid and topping it off can be tricky. You may have to grind a bit off the bottom inside of the reservoir as it may also not fit perfectly level left to right. The reservoir will hit the bar. None of this is rocket science and it all will depend on how you set the bars to fit your height and comfort.
Another issue is that these bars probably do not have the threaded inserts for remounting your stock grip end caps with the tiny little long allen head screws. You can get around this in a few ways. I originally bought some tapered rubber plugs from Lowes or Home Depot, drilled a very small hole thru them, then drove them into the bars and used the stock screws and end caps. The rubber held the screws tight enough to keep the end caps on.
Later, I installed some Manic Salamander bar end weights, which have their own expanding insert to hold them in the bars....
Manic Salamander I'd post some pix of both but Photopost is fubar right now.
To me, the riding comfort is well worth it. The trick is to get them set to where your wrists are relaxed, but the bars don't hit the tank. Some risers or Jim's spacers may be needed.
Spacer Jim Cables and the front brake hose may be an issue as well. The throttle cables can be mounted on the right side of the frame if there is a problem, or you may find that relocating them above the big wiring harness lump on the left side of the frame near the neck may be enough to give you clearance. You'll know if you need more clearance if the engine revs when you turn the bars all the way to the right. The clutch cable and the front brake hose will also need to be checked, but there is no re-routing solution for them. You will need longer ones if there's a problem. Brent can fix you up. I went with 4" over originally, then got a 6" over clutch cable to clear my Windvest windshield without scraping it on a turn.
I suspended my bars from my garage ceiling while I changed everything over to the Buckhorns. It's easier than asking someone to try to hold them while you fuss with all the pieces.
Other than that, it's a piece of cake...
