Yep I have both.
I love my thermy but I love my slow cooker about the same but for different ways.
Slow cookers are great for being organised and getting ahead. I searched and found a heap of recipes I could do as 'dump bags'. So everything is in and ready to go and in the freezer so when I need to I just grab it out the night before to defrost a little in the fridge then chuck it in the slow cooker about 9am and come 5.30 it's all ready to go, just add rice etc.
I also do my roasts in there a lot now. I chuck whole potatoes an onion chopped in half and a few carrots in the bottom then stick a hunk of meat on top (usually quickly season and add some mustard powder then brown quickly). With about 20 mins to go I chuck the veg in a really hot oven while I'm cooking my Yorkshire puddings. You can use the juice in the bottom of the slow cooker to make awesome gravy to 😊 I still do my roast chicken in the thermomix tho.
I bought the slow cooker central iBook but had to really trawl through to find things that were to our taste and I modified things a bit to add extra veg etc as I feel like some stuff wasn't that healthy.