Basicly I wanted a counter point to the other thread
rules and concepts that you feel are really good strategies/tactics for the Tau to utilize in the new edition.
For example, as much as some people seem to feel Crisis suits are overcosted, I really like the way fly works with falling back, these guys feel so rediculously mobile, abile to move wherever the hell they want, even out of melee, while still laying down fire. You can make sure to always have heavy firepower exactly where you want it and there is little your opponent can do about it (short of killing them, obviously).
Crisis suits with flamers are particularly nasty vs melee heavy armies, as they are very dangerous to repeatedly charge at.
Also wanted to make a note of some things I've noticed while trying out tidewalls. At first I was in two minds about them, they seemed, on paper, to be better employed by standing behind them, not actually embarking on them, this is because firewarriors (your likely gunline) just lose so many buffs by embarking, including 'for the greater good'.
However, I discovered in practice that tidewalls are actually a nice versatility tool, when facing off against a lot of anti-infantry ranged firepower, embark them for the protection, when they charge the tidewalls, disembark and fire from behind them (since you can still fire on enemy models within 1" of tidewalls). They work even better vs melee heavy armies, as you can still 'for the greater good' when standing behind them if someone charges the tidewall itself (and they cant charge through it as its an enemy model). Overall they made my firewarriors a lot more survivable in the early stages of the battle so they could get off more shots before dyeing.