I've only had a few nights on the mattress so far but I'm really impressed! Order arrived after only a few days (free delivery), sliding out of the box, unrolling and watching the mattress decompress was quite the sight!
The build quality and materials seem of high standard.
I then left it on the floor for over 48 hours to finish and switched it with my old mattress. The top layer is quite soft and cushions the legs, body and head well while the main body of the mattress is firm enough to give support throughout sleep. I'd say a medium firm level mattress.
Highly recommend iSleep for competitive prices, quality mattresses and to support Irish companies.