Growing a Zkittlez from them now and I'm pretty impressed. It's become very big so that's something to take into account. Very hungry too.
Really lovely structure with little training, strong and productive side branches. Looks like she'll be a heavy yielder.
The only other FB strain i've grown was Tangie which my GF and other friends have requested I grow again. Another excellent choice from their catalogue. It's a massive plant, high yielder (pulled 9oz) and has a wonderfully energetic high with no raciness that mellows into a great body stone. Nice taste but benefits enormously from a long cure.
I'd consider looking at that one if you've no space issues. Seems to get overlooked for all the new strains but it's a joy to grow and smoke.
In fact, you've made me return to the jar to twist one up.