Scary stuff for my poor old Blood Angels. I really struggle against riptides. My THSS termies do the job on them no problem as long as they can catch them. Mass plasma does it a fair job as well. It just hard to get enough shots at them to strip off all those wounds.

For what it's worth I'm not sure Tau need allies to be totally amazing. However from a fluff point of view I love the idea a chapter turning to the greater good. Fantastic modeling, painting and gaming options all around!