I have had poor Germination rates with Nirvana.
Bomb Seeds "Cheese Bomb" I have had many problems with. Real problematic with nutes, It is either deficiency or extreme burn. The is no middle ground with this strain. Cloning is a joke. I am cloning 6 diff strains right now. I have close to 100% success with all but the cheese bomb. It is closer to like 10% rooting on clones. Have only had 1 successful grow with this strain. The smoke was good, and a real sleepy stone. Works great for insomnia, but a pita to grow. stay away unless you want a challenge.
Edit: I am still growing this because I am a glutton for punishment. If you do decide to grow this, I recommend starting VERY weak on nutes and slowly increasing. That's the only way I have been able to grow it.