Weekday is a weird one. It's run / owned by the same people as Cheap Monday, and are now all under the H&M umbrella (along with COS of course). The Weekday store stocks in house stuff, but also Lemaire and Hraun (Cedric Jacquemyn, an Antwerp Academy graduate). So that is quite cool.
The clothes themselves... I think i've made maybe 4 orders from Weekday and 3 of them all went straight back - every piece. I bought a few things from the recent sale i'm still deciding on. Prices are quite similar to COS but the quality and construction is not as good. Everything looked better online than IRL. I wouldn't say much of it was worth it RRP. Weekday have two lines - mtwtfss Weekday and mtwtfss Collection - the latter being the slightly more expensive and marketed as more 'grown up' side of the brand. They also have this guest brand called 1440 which seems kinda sporty / Russian suburb type thing (last summer reminded me of a poor man's Gosha Rubchinskiy) but that's a bit hit and miss as well. I know a Scandi girl who is into COS etc, and she has also commented on being a bit disappointed with her Weekday orders, so i know it's not just me. Their collections are also quite small each season.
There was an oversized / closed placket felt'ish wool coat they released earlier in the season i would have liked to try, but most nice things tend to sell out quickly.

I guess it's cool they're trying to do something a bit different but in my honest opinion i'm not convinced it's working that well.