I’ve not had any call back, or heard anything negative in the several I’ve installed, albeit on driveways.
Equally, as you suggest, suitable for a patio.
It is porous, providing your wearing course is also porous.
Essentially, what increases the price point is the wearing course. Excavation, sub base prep ( levelled and compacted MOT type 1, although type 3 suggested) and then open grade tarmac - which gives the porosity. Can go on concrete, but need to have me any falls, or run off onto lawn or beds.
The cost of the resin( albeit not purchased any since lockdown) was around £30 per sq m for purchase. As an equivalent, Indian sandstone is that now. It’s put down to a depth of 15mm for pedestrian use, 18mm for driveways.
The supplier I purchase from can also supply a one man tutorial, or course in laying, whereby one experienced operative is supplied with relevant equipment/mixer/screws box supplied for what I think a reasonable cost. With another 2/3 helping, usually laid in a day unless a vast area.
I recall the largest area we laid to a finish in a day was~130 sq m.
Done well, it looks lovely and will last….
Hope this helps.