My Monster had one installed when I got it. Thought it was useful for chain lubes and such and it actually protected my left can when I had a low speed low side.
But it rusted up solid

and in order to remove it for repair, I had to buy a rear stand.
So I never put it back on. Ended up giving it away to a DMLer who really wanted one.
I say get a rear stand and to hell with it.
By the way, it's heavy as hell. My bike weighed in at under 400 lbs at the track this summer (no super lightweight parts, just general clean-up). the center stand would surely have put it over 400.