I mean, not rock rock hard, still a little give. I let it get too hard once (heh), definitely know what that feels like. I'm going to put them in the fridge overnight to stop them from getting too pressurized.
Even then, i've only had bottles blow their top, not ever actually explode.
I opened the plastic bottle tonight and it had good carbonation, so I'm not concerned too much about bombs.
Bottled: Cinnamon Apple Cider, Two Hearted Clone, FW Double Jack Clone
Kegged: House Pale Ale, Russian Imperial Stout, Milk Chocolate Stout/Porter Partigyle, Graff
On Deck: DIPA w/Heady Topper Yeast, Winter Warmer, Imperial Red