There is a hand-me-down slow cooker also in my house: have never used it actually. I will trust in devotees' love of their slow-cookers and maybe give slow cooking a whirl (!!) one day either in that slow cooker or using the p/cooker in slow-cooker mode !
One passing thought re modern electric pressure cookers: seemingly they do not reach quite the same high pressure that a hob-type p/cooker can. Whether that puts them out of the running for making preserves I wouldn't know.
Um, a 2nd passing thought: I find there there are even pressure cookers 'pots' for use in a microwave !! I believe they are relatively expensive (for what they are), but I'd be interested to hear about experience if any member has ever used one.