I view Imp Revived Pet as a must-have for BM. Sure, you say that you can keep your pet alive, yadda yadda. As you progress further in the game, it gets harder and harder to keep your pet alive. True, the 2piece T5 helps with this, as does Imp Mend Pet.
But there are situations where a boss AoE will simply one-shot your pet. Honestly, if your pet is dead as a BM Hunter, you lose a good chunk of your DPS. 15% may seem like a little bit, but it makes a big difference. Plus you lose The Beast Within and Ferocious Inspiration. This makes you even less effective, plus you lose the group buff.
Overall, spending 4 seconds is much, much better than 10.
Edited, May 28th 2008 6:14pm by Zeromatter