If I may:
I wear the Blue Dragon trinket and love it (60 UD Priest, currently trekking through BWL).
It has to be compared to other 'good' mana regen trinkets to keep the discussion in scope.
On average, I regen approximately 100 mana per tick (and it stacks with Meditation, etc as discussed before). As such when this procs I will regenerate 750 more than I otherwise would have as long as I stay within the 5 sec rule.
750 Mana = 341 secs for Mindtap Talisman = 234 secs for Shard of the Scale
With a 2% proc rate, that means that on average there will be one proc per 50 casts (obviously a statistical simplification).
341 secs = One cast per 6.8 secs for Mindtap Talisman
234 secs = One cast per 4.7 secs for Shard of the Scale
As such, for any fight in which one would cast spells rapidly in sequence more often than the time periods described above, the Blue Dragon trinket is uniformly better than those noted.
Three additional points:
1. The mana per 5 secs trinkets apply mana continuously whether you need it or not, it is flat regen. The Blue Dragon trinket is 'spikier' statistically, but applies regen in a large burst primarily when spam casting. As such the Blue Dragon trinket is more likely to provide its full regen when it is most needed.
2. Because the Blue Dragon trinket is a 'proc', the user's behavior can be altered based on the occurance of the proc. When it goes off, one actively chooses to continue casting rather than to intersperse long pauses to regen mana. This alteration of behavior greatly improves the trinket's utility and improves the overall performance of the raid group. 'Flat' regen trinkets are passive rather than active and do not allow for player adjustment (skill) to improve their utility.
3. Because the Blue Dragon trinket is dependent on Spirit, it 'scales' as gear improves which is something neither of the above will do. Thus this level of regen represents the minimum which my character can reasonably expect from it.
-kersh
Dehmien | 60 UD Priest | Stonemaul
P.S. In-guild tests have confirmed that Meditation, 3-Piece Transcendence, Spirit Tap and Innervate all stack with the trinket: 280% Regen * 4 (and doubled Spirit)[While Casting] The key to this is to keep casting during the effects. If you stop casting and allow the 5 sec rule to pass you will return to 100% Regen (*4 with doubled Spirit). Thus in-casting regen can be higher than out-of-casting regen.
100 Mana per Tick Base -> (Approximately) 2100 Mana per Tick fully stacked
Edit: Added P.S.
I wear the Blue Dragon trinket and love it (60 UD Priest, currently trekking through BWL).
It has to be compared to other 'good' mana regen trinkets to keep the discussion in scope.
On average, I regen approximately 100 mana per tick (and it stacks with Meditation, etc as discussed before). As such when this procs I will regenerate 750 more than I otherwise would have as long as I stay within the 5 sec rule.
750 Mana = 341 secs for Mindtap Talisman = 234 secs for Shard of the Scale
With a 2% proc rate, that means that on average there will be one proc per 50 casts (obviously a statistical simplification).
341 secs = One cast per 6.8 secs for Mindtap Talisman
234 secs = One cast per 4.7 secs for Shard of the Scale
As such, for any fight in which one would cast spells rapidly in sequence more often than the time periods described above, the Blue Dragon trinket is uniformly better than those noted.
Three additional points:
1. The mana per 5 secs trinkets apply mana continuously whether you need it or not, it is flat regen. The Blue Dragon trinket is 'spikier' statistically, but applies regen in a large burst primarily when spam casting. As such the Blue Dragon trinket is more likely to provide its full regen when it is most needed.
2. Because the Blue Dragon trinket is a 'proc', the user's behavior can be altered based on the occurance of the proc. When it goes off, one actively chooses to continue casting rather than to intersperse long pauses to regen mana. This alteration of behavior greatly improves the trinket's utility and improves the overall performance of the raid group. 'Flat' regen trinkets are passive rather than active and do not allow for player adjustment (skill) to improve their utility.
3. Because the Blue Dragon trinket is dependent on Spirit, it 'scales' as gear improves which is something neither of the above will do. Thus this level of regen represents the minimum which my character can reasonably expect from it.
-kersh
Dehmien | 60 UD Priest | Stonemaul
P.S. In-guild tests have confirmed that Meditation, 3-Piece Transcendence, Spirit Tap and Innervate all stack with the trinket: 280% Regen * 4 (and doubled Spirit)[While Casting] The key to this is to keep casting during the effects. If you stop casting and allow the 5 sec rule to pass you will return to 100% Regen (*4 with doubled Spirit). Thus in-casting regen can be higher than out-of-casting regen.
100 Mana per Tick Base -> (Approximately) 2100 Mana per Tick fully stacked
Edit: Added P.S.