Well I suspect I've mixed my models up with this one too:
LJ900 150N light life vest 14 - | Decathlon
Half the price! But no crotch strap (pretty much considered essential to make the life jacket work with your head above the water) and no light (could be added for £15) - depends on your activities if thats likely to be needed. The more expensive one has the yacht racing harness built in, as does my Kru Sport Pro. That means carrying extra weight around my ever increasing belly for little reason as I don't do big boat sailing...! Don't think either have a spray hood. But all comes back to your expected rescue scenario. Fall over board in company of mates, unlikely to be unconscious as not much to hit head on, own crew competent to rescue you. Working in inshore waters where a lifeboat likely to be onscene within 30 minutes of launch, launch tiem 10minutes. Only summer activities in good weather with minimal waves. 150N possibly OK. Major passages, lots of miles off coast, single handed, not in company, in rough weather including during colder months. 150N is almost certainly not enough.
Its also not be a direct spinlock clone. Tribord use a popper system for the cover. I prefer the Kru bursting zip method and I think (been a while since I looked) spinlock use the burst zip too.
But I think the ergonomics of the spinlock make sense and thats what they've 'copied' and I think there are some good features like the viewing window for the cylinder (My Kru one is burried inside so a pain to inspect).
I could swear the decathlon used to be 170N - don't know if they've changed the spec I notice they list a HalkeyRoberts 2012 Cylinder but are now on a UML 2014 Cylinder...
Frustratingly adding 20-30N of extra CO2 (20% bigger) seems to have been a licence to print money as the price seems to go up by nearly 100%...