#1 - weather protection, i can ride year around in NH with this thing
#2 - tank size, with 6.1 gallons I can easily go 300 miles between fill ups
#3 - Comfort, rider triangle and seat better than the other dual sports for me
#4 - reliability, not any better than other dual sports but it is important
Just for fun, reasons not to buy a klr...
#1 - offroading, if you plan to spend more than half your time offroad you will probably want to look else where. Too much plastic equals hard to protect, heavier than other duallies, stock tires are terrible off road, not a lot of suspension travel, too soft of suspension, and large tank is just extra weight.
#2 - Fuel economy, almost every other true duelly on the market gets better FE save the DR650 (ie bmw 650, drz400, dr200, klx250s, wr250, xt250)
#3 - High speed highway cruising, at speeds exceeding 80 mph things can get unstable and engine is revving very high with not much left.