I never give all my trust over to any software that is about to partition my drive.... but I can tell you that I have done a dual boot with previous versions and it turn out ok, it even linked the Windows Partition to my desktop in Kde for me.....
but I don't think anyone here will stake their name on it, that you wont run into a problem......
Best Rule of thumb: If you NEED it, BACK it up!!!! Windows is easy enough to reinstall....