not good; I would like some wind protection, I know trying to replicate the OEM guards Great Wall would be near impossible though.
If you had to choose between the Acerbis and Tusk? tossup? I will look into the Maiers too, I keep hearing good things about them.
Barends; I would hate to remove anything from my KLR that would result in MORE vibration. Do any of these hand guards allow retention of the bar ends? I seem to notice the pre-08 bikes did not us bar ends?
Handguards help reduce handlebar vibration because of how they are mounted (think about it). They are mounted by internal end of the handlebar and clamped to the mid-bar with a metal bar between them. and don't forget they will most likely save your handlebars from bending during an easy get off.
The Tusk came on a 2003 KLR I purchased. The left guard inner clamp touched the clutch cable mount. The metal bar had to be bent for the clearance.
Cost, looks, strength, hand protection, and wind blocking are things to consider.
Acerbis Rally Pro is the standard but they do not have good wind blocking.
Tusk D-Flex needed to be modified to fit my 2003 properly. It has two separate (removable) plastic covers.
Maiers looks like the it will do everything well except the covers would be off during hot weather.
There are other models of these manufacturers and other manufacturers.