I thought I should update this thread.
I was at my parents place in Spain recently, and they happen to have a
Decathlon very close by, so popped into just to have a feel of their shorts.
They didn't have the top of the range ones in, but seemingly everything else below them.
Unscientific, but I had my progetto X2 equipped shorts over with me, so compared the squeeze test on the pads for kind of thickness and density, and unfortunately, for me, the Van Rysel pads didn't feel like they would provide enough support.
My brother was over as well, and he had some SYN (Another Aliexpress one) shorts, and the pads on those felt better.
I decided to go with the recommendation above, having heard that name mentioned previously, and due to a £7 voucher thing, managed to order two of their shorts - one was in theory about £20, the other £30, but in the end they clocked in at £43.
If people are interested I will post the specific links later.
I went for the EU Small size, and for me it's pretty much spot on - the compression around the legs, and strap length is perfect.
The fit for me, is just ever so slightly larger than Castelli - just beware and check the size you are ordering, as I think the Asia size is one up, so mine is an Asia Medium but EU Small.
I did the pad feel test, and was impressed with both - I've only worn then once each for two turbo sessions, and have been impressed with the comfort of both pairs. The cheaper pair has that slightly nastier (in my opinion) shiny material thing going on, but not a problem once on and it's only for the turbo, the pricier ones had slightly nicer material.
The straps are also lovely and wide.
My only negative, and I need to give them both another batch of rides before I decide whether to commit to more and if so which one, is that the pads feel a tiny bit large for me, and ideally they could be a bit further back, although in reality this caused me no issue on the turbo, so I suspect they are on the border, but wouldn't cause me any comfort issues.
Very impressed though for the money, really surprised and a country mile away from the chinese cheapies I tried several years back which were total junk in comparison.