Why does it not show the damage if i am on physical i never see damage increase? i think this ring sucks.. 4 seconds is nothing then u have to wait over 30 sec again before physical comes in again ? wow... a stone of jordan is alot better and gives u dmg to elites way better against bosses if u ask me, i think a skull grasp is better since u have dmg nonstop and not for a few second a useless buff u dont notice anyway...
25% uptime on a 150-200% damage buff, combined with perfect primary stats (STR/CC/CD/Socket)... Well if you think that sucks then sure go ahead and ignore it while everyone else uses it.
I don't understand what you are referring to Bigbazz? If you use WOTB during the physical buff, how does that give you two rotations of the physical buff? And why would you want to use Rend during the lightning buff? Most people that use Rend use the physical rune.
You use Rend during the lightning so that you don't have to use it during the Physical, so that you spend the whole physical generating dust devils while rend ticks away. Using WOTB at that point is when you don't have Perma WOTB. A lot of people (myself included) are running Bul Kathos weapons instead of the 3rd piece of IK for the perma WOTB, so using WOTB at the right point is quite important with this ring.
Either by choice or lack of choice (due to drops), BK weapons are very strong anyway.
Convention of Elements also lets you stack buffs on top of it to increase potency (like Wrath of the Berserker), giving it more value than the "average" of the 25% uptime, if you rend on the lightning buff and then use WOTB just as the Physical buff comes on you will be able to get 2 rotations of the physical buff during WOTB to maximise efficiency.
it's also a bonus that is present on non-elite packs and so has more of a broad value than SOJ. On top of that, you're only losing a secondary stat on the COE ring to get the bonus, not a primary and so that means you can have ideal base stats with no penalty.
Convention of Elements is the king now, the damage bonus is just too strong to let go.