No, the Purflo is no different to the sleepyhead. Just because it says it is certified - certified to what standard? There is no standard covering baby nests like this. It probably meets fire safety regulations or something. Irresponsible marketing.
In fact I looked as their FAQ and it says this:
"What tests has it passed and who accredits them?
"The Sleep Tight Baby Bed design was created using the most up to date and relevant safe sleep guidelines. As with any new Purflo baby product, advice was sought from two independent UKAS accredited test houses to determine the most appropriate testing.
"The product has undergone a comprehensive risk assessment and extensive, exhaustive safety testing relevant to marketing it as suitable for overnight use. Specific testing includes breathability, flammability, and unlike many nests and positioners in the market, rigidity and retention of side walls and roll tests."
What does that actually mean? First of all it doesn't actually mention any specific standard which is likely because one doesn't exist. OK, so it's good that they've then done their own tests, but still, "breathability" for example, generally this refers to airflow in terms of avoiding sweat, for example in sports shoes. It does not mean that an infant can press their face against it and still receive a sufficient flow of oxygen. But this is not explained by the company, presumably because they are happy to live with the misconception that "breathability" means you can breathe even if you push your face into it. What does the roll test involve, what does that mean? It can't prevent the baby from rolling, because it doesn't have any mechanism to do that. Does it prevent an adult from rolling on the baby? Honestly, if you're so deeply asleep/drunk that you don't notice rolling on an infant, you're not going to notice rolling onto a pillow either. And if you are not drunk or a deep sleeper, you can co-sleep more safely without using products that make it more likely the baby will be placed in a less-safe part of the bed.
How are products like this different from cot bumpers which are a known safety risk for infants?