For me, a centre stand is a must have item if there is one available for your bike model. It makes working on the bike easier in every way, from changing tyres, to cleaning and lubing and loading the bikes. SW Motech makes one specifically for the DR650.
The price of the kit was US$160 from Procycle. It was well made, nicely finished and came complete with all the parts needed. I used blue loctite 242 on the foot peg bolts. Installation is easy, just allen keys or hex drivers required. The hardest part is installing the two springs, I gripped them with vice grips and put my foot behind the rear wheel to brace the bike; two almighty heaves later and they were on. Total installation time was around two hours.
Getting the bike onto the stand requires quite an effort, especially with the bike loaded with gear. My method is to hold the pannier frame with my right hand, give a couple of bounces off the front suspension and pull upwards, then backwards in a continuous motion. It's much easier if the bike is setup with standard height.
A common reason people give for not fitting a centre stand is the impression that it reduces ground clearance. In practice I have not found an issue with this, it tucks away neatly and have never had it scrape the ground. It adds a little extra weight to the bike, I didn't weigh it, but probably around 3Kg; however it's down low right where you want it and the benefits outstrip the weight factor for me.