We’ve had the Sage Fast Slow Pro now for about 6 years and it has been brilliant. It is both a slow cooker and pressure cooker in one with the added ability to be able to sear, do reductions, sauteing and steaming. Plus it has a lot of pre-sets for foods from rice, stocks, casserole, soups, pot roasts, lamb shanks, legumes, bolognese, puddings as well as custom settings. The removeable pan inside is a 6 litre non-stick.
Yes it is expensive compared to many just slow cookers out there but we have not regretted buying it. What I like is the ability to be able to brown or soften your onions etc and sear your meat in there too before either slow cooking or pressure cooking and then if you want, being able to take out your meat when it has cooked and change the setting to reduce and thicken your gravy, making it a real one pot solution. Oh, and it has a keep warm function too.
As for the pressure cooking, because it is all automatic it is very safe and you never need to go near it when it is releasing pressure, which adjusts according to what you are cooking (slow and in bursts for stock to prevent it from being cloudy) and just wait for the ping indicating when it is ready to open.
Of course, it is horses for courses as a simple slow cooker with a high and low setting will do the job and yes, having no electronics it is unlikely to go wrong. But, I guess like our coffee machines, some are happy to stick with a simple Gaggia but others like to go for something that gives them a bit more to play with.