I'm not saying ALL the things in decathlon are crap, including their skiing stuff, (and by the way I couldn't ski to save my life), even their actual bikes themselves I think are probably quite good. I'm just saying that the list of accessories I've had that have been substandard are:
Chain - tight link, probably fake. One from
CRC was in a proper hard box which is exactly the same as the ones in
halfords and the ones i've seen in LBSs.
Camelbak - chest strap attachment far too flimsy, kept falling off and got lost.
Tube - didn't have thread on it for valve collar, despite being pictured with one on the box.
Bib longs - padding in the wrong place. Uncomfy.
'wedze' socks (they are skiing ones actually) - developed a hole after a few weeks.
The way I see it, I could go in there, and TRY something from there, and save a couple of quid, but there's a good chance I'll end up having to take it back again, so I just save myself the time and get a quality one from somewhere else to start with.