There are no cons to it.
Its really the luck of the draw. If your crank isn't welding you always stand a chance of it coming apart. I've seen banshee's with only pipes and filters have cranks fail, but then I've seen well built banshee's not have an issue...so its all luck and taking the chance IMO.
First thing I did when I bought my 06 was had Wildcard Racing tear it down and inspect the crank, true and weld it....along with there porting of course