hi this is the first time i play with a priest and i want if know if u have mana reg problemes it's ok to stack +16 spirit gems ? (i'm holy priest) ty
Is it ok? yes. it's it recommend? no. You have talents and your special form to help fill gaps.
I don't know how I slipped into spriest based-answers.
the stat weighting is currently at
can you personally find it useful for quest grinding or soloing? perhaps. but for grouping/dungeons/raids... not a good stat
Alternatively look for different methods that cut down your mana consumption (casting correct heals, people avoiding damage). Regen is useful and being mana constrained is an important aspect of play but you spirit stacking is not essential. Make sure you are using your shadowfiend and prayer as often as they are up and if no one is in immediate danger of death focus on efficient heals instead of quick or large ones.
Mana is much tighter than it has been in the past, but you will see a greater return from play style changes than how you gem.
The number one thing is to NOT top people off. It is ok to keep DPS around 60% and the Tank around 80%. This will decrease overhealing and increase mana longevity a lot.
Use Heal, even when you want to use something else. Greater Heal will bring people back up quicker, but try to reserve it for the Tank as much as possible. Even on the Tank try to rotate Heal & Greater Heal. In most cases it is enough to keep people alive and stable without burning mana.
Renew is great after the last mana cost reduction. Using Renew instead of Healon DPS will allow quicker return to healing the Tank. That can be the difference between needing to use Greater Heal or having time to cast two regular Heal spells.