I HAVE NEVER seen a ban of any website solely for using xrumer. What seems to be the common trend is that google will not rank you for the link text in the spammed links, if you were not ranked for that keyword before. Also, you do stand to lose some of your page rank.
I regularly bump 100k success to many of my sites and haven't had any banned yet.
When doing this, I usually get about 1,500 uniques on the day of and the day after the blast.
Please note I did say 100k SUCCESS not a measly 100k blast.