It depends I think, personally I pull it tight enough to test it knowing that it's under tension, but I've learnt it will snap if you pull it too much, it's more like a mainline, if you did a boom of mainline with loops at both ends, you know it will snap eventually, you kind of have to treat it like that,
I did also go through a phase of having doubts about them, but over time I've just got used to them and no longer worry, I use the 15lb boom with XS crimps. You definately need the right size crimps for BS.