I have used both of these many times & feel perfectly safe with them. They have a lot of safety features & a locking handle that prevent opening while it's locked, & you can't unlock it while there's still pressure. There are automatic release thingies so if the pressure bilds up to much, it's released.
I love both of mine. The smaller one is great for everyday meals, while the larger one is for soups, stews, etc.
I forgot also - Bed, Bath and Beyond sells Fagor. I bought the duo combi set from them (4-quart and 8-quart) with their 20% off coupon. That price even beat Amazon, but now it looks like Amazon is cheaper. It definitely pays to check for the best price.