Pyros
<Silver Donator>
For Heart, like TBN, I just have the button twice, one normal for self use, and one macro with <mo> for protecting other ppl/offtank. The other classes have 2 buttons anyway so it's basically the same.You can use it as an anti-tankbuster since it has 30% for 4 seconds but honestly just have it on 100% uptime I think is best. It heals you either when you hit 50% or when it expires so it can't be "wasted"
I like to pop it between packs so it heals after a few seconds of being hit then the Cd is right back up again.
Edit: I also macro'd it to mouseover cast. You lose the ability to double-weave it with /most/ abilities (2nd hit of continuation and blasting zone is still possible without clipping) but in return you can cast it on anyone on your party, which I think is worth. Saved a healer with stacks many a time from big hits in raids with it.