After not really enjoying our first night on just the Vango 5cm airbed, I decided to look at spring options. In the UK, Austops can be installed with a Froli system, which is over 1k as an additional extra(!). As I live in Germany, I found another German option called CubeCamp. And for 150 EUR I got a set of 60 elements, which has 3 different firmness ratings, 3.3cm deep, whereas the Storm poptop has space for around 7. Made a world of difference!