I used them once, delivery took about 2 weeks but stealth was one of the best I've seen. All beans I germed popped and grew into healthy plants. Check my sig, It is nirvanas white widow and northern lights. Not the best thing to go off because it was one of my 1st grows but they still came out awesome considering I was such a noob. Can't beat their prices either. Just wish they had more selection.
Bought chrystal from a seedbank, original pack, 1 popped not a good plant at all, returned seeds to bank, Nirvana replaced them promptly. I gave them away but I can't fault Nirvana, probably seedbank storage habits. Never grew it again but kudos for their customer service, I did not get feedbank from the recipient, though.
In the last year (2013) I've made 3 purchases. All 3 were delivered with no problems. First shipment was a normal one, following 2 were 'stealth' shipped. 9/12 seeds popped, the 3 that didn't were 'jock horror auto fem'. Hope this helps!