Been running WW in multiple BMW's, including my 328Ci Track Toy, 3 M3's in various states of modification, an E39 M5, and a Z4 M Coupe, for the better part of a decade now, with AF:H2O ratios ranging from 40:60 to 0:100, and not a problem, ever... Nor have I had issues in Porsche Cayman R (modified, Track car), Porsche 930 "Slant-Nose" Turbo with a fully built motor (630RWHP & 535RWTQ), a '93 RX-7 Twin-Turbo, an '05 WRX STi, a '11 Golf R (making as much power as can be expected without an engine build-up), '12 Focus ST, '06 BMW X5 4.8Si, '09 335i Coupe (476RWHP 483RWTQ), a Lotus Exige S240, and so forth...
Not a single incidence of cooling system issues, and all but the X5 have seen at least a half-dozen track/autocross days...
IN MY OPINION, it is likely incompatible with certain types of antifreeze and not with others...