I think Capn Paranoia of this parish is also a bit of a fan too.
I am indeed. Given the decline in the quality of stuff in TK Maxx, I have moved from being 'man at TKM' to 'man at Decathlon'. It also coincided with a branch opening near me...
It's worth bearing in mind that Decathlon have a 'vertically integrated product range'. So the quality (and price) varies. But none of it is
rubbish. The top end stuff rivals the fabrics and design of the big boys with ease, and beats them hands down on price.
The only problem I have is that they do have a habit of fiddling with designs that are perfect, and making them poorer... Oh, and constantly changing the names of the same product...
The stand out pieces for me are:
winter soft shell trousers (originally Forclaz 900 Warm, then 500 Warm, then...)
Simond Mountaineering trousers
(actually, all the 'higher end' trousers)
lightweight down jackets (the £40, 900fp ones, although they messed up the hood design a couple of years back, and now completely revised)
Techwinter 500 shirt (a waffle inner face thick base/light mid fleece)
Simond Alpinism shirt (similar to the Techwinter, but more fitted, and a bit warmer)
Synthetic liner gloves
I'm also very happy with the Simond Alpinism boots, which have given me no trouble at all, even after very minimal breaking in. Some of their more casual shoes are a very narrow fit.
And I have a favourite soft shell jacket, sadly discontinued, the Forclaz 900 'Soft Spread', which has a hexagonal inner flocking, working like a VR. The flocking is lasting better than expected.
The Mountaineering trousers are pretty legendary on UKC; no 'what winter trousers?' thread passes without multiple references to them, with many people preferring them to more expensive, branded trousers
they own.
On the other hand, the tailoring of some of their products is bonkers; great fabrics, but ruined by stupid pattern cutting. I've provided feedback, and product improvement suggestions on a number of occasions... They could do a R1 hoodie/ME Eclipse/Montane thingy killer if only they tried just a bit harder. They almost managed it a couple of years ago with the Forclaz 900 hoody, only the made an unnecessary pig's ear of the hood, adding a low collar inside the hood, and making the hood a poor fit, and floppy. Great fabric, great price, terrible hood. Sigh.
Oh yes; go up one size from 'normal'. I'm a perfect 'M' in Decathlon. Which is nice.