I am wary of pressure cookers with complicated valves and gubbins. I got the simple one which works with weights as a wedding present. I loved it and used it a lot, but would like one with a stainless steel pan rather than an aluminium one.
In between times I had a more modern one which had a plastic handle with an integrated valve system, but that didn't last very long.
However I am sure they are safety tested these days and the quality of the plastic has improved.
The picture shows a pressure cooker which works similar to my old one, although it is not a Prestige.