Originally Posted by
Gardiff
It's just really difficult to answer that question. When you consider CBT, you have to also consider AG which procs from CBTs final burst heal. If you give up CBT, you are likely giving up 15% (or even slightly higher) of your output (if spec'd AG) as a result.
Does the extra mana gained from BD outweigh this? Well if you are not going OoM, then no it definetly won't. But even if you are OoMing, BD has a lot of problems. We already have a high baseline crit on healing surge, making any additional gains from BD very minimal. CH also will eventually crit 10% higher and we can easily achieve 25% crit or so on beta (not exactly optimal for HPS, but better for HPM), and so again BD will not provide much from CH. It might be interesting to use with Queen's Ascendant, but CH already crits (on average) per CH cast so I don't see how BD would further augment Queen's Ascendant.
If it is used at all, it's power is going to have to come from HW/riptide usage. HW in particular grants a large amount of mana back for how much it costs.
But just how do you estimate how many HWs are cast on sub 60% targets (and be sure to remove 1/4 of those (assuming you are sitting at 25% crit) since the ones that crit below 60% would have proc'd resurgence anyway). For riptide, it may be easier since its instant cast, but HW still has a 1.5-2.5 second cast time - someone who starts out sub 60% pre-cast might be above 60% by the time the cast hits in a raid setting. I really don't know how you would even begin to estimate something like this.
It will probably be something figured out on live from a large number of people testing it, but I can only really speak subjectively about it in that it was very underwhelming when I was using it early on in alpha, even with HW/riptide. I was seeing something like ~20% additional mana in these ~4-5 minute encounters but this absolutely does not translate into 15% output in any form because this doesn't take into account all sources of regen. I dunno, maybe others on beta who used it got more out of it, but I certainly did not.
I don't think using it would let you really substitute in very many healing surges at all for healing waves because again for me, I was still only getting MINIMAL gains from using bottomless depths.
Again, it works a little bit better with riptide since riptide is an instant cast, but the problem becomes that you will be losing out on a ton of healing if you are just holding onto riptides in hopes of finding a sub 60% target. It isn't worth it in this regard. But it is easier to work with. Healing wave, however, is not always fast (even if you go crashing waves) and if you happen to start a 2-2.5 second cast on someone who is hovering around 50% in a raid, chances are pretty good that person will go above 60% with HoTs and random passive heals (or other raid healers focusing that target), making bottomless depths much less valuable. And the last thing to consider is that when people are really low, chances are you WON'T be using healing wave / riptide to get people up - rather you will be relying more on CDs, wellspring, etc and a lot of these heals just don't work with BD.