benefits are the SBK stand looks nicer and is lighter. no cons that i can think of.
note that my earlier comment about it being a straight swap is NOT correct. you'd need to take the actual stand off the bracket along with the springs and install them on the monster's mounting bracket. as pointed out in the other thread, using the SBK assembly as is will result in the stand interfering with your exhaust header. i didn't realize this before because i didn't have any exhaust on the bike at the time.
btw... being the "supra-genius" that i am, i immediately sold my monster's kickstand assembly to recoup some $$$ so now i'm in need of a monster's mounting hardware. anybody got one laying around for sale? (yep... i'm a bone-head!)
forgot to mention another benefit is that the SBK stand tucks up a bit higher so you don't drag it when leaning WAY over in left-handers.
Just to clarify, the extra lean you're talking about is when the bike is parked? I put a SBK sidestand on my M900 and it's just fine when parked. In addition, I've got a little more lean angle when riding. Not to mention it saved a bit of weight and, arguably, looks better (although the one I have could use some cleaning up).