They're definitely dangerous things.
I got one (Egg) for myself after needing to buy several things from the States and having to jump through hoops borrowing my Dads card, etc because - like you - I was in a similar position, only had a Switch card which no one worth their salt would accept.
After convincing myself beforehand that it would purely be a "for purchases that require it and nothing else" I quickly found myself buying stuff I would've otherwise thought twice about (or needed to save up for) because, well, I could. I didn't get into any trouble or anything but the last 6 months or so I've basically paid off about £2000 off my two cards (I got a MINT card to do a 0% balance transfer from the Egg card).
If I had a choice about it I'd stick with just having a Switch card - definitely safer.
I got one (Egg) for myself after needing to buy several things from the States and having to jump through hoops borrowing my Dads card, etc because - like you - I was in a similar position, only had a Switch card which no one worth their salt would accept.
After convincing myself beforehand that it would purely be a "for purchases that require it and nothing else" I quickly found myself buying stuff I would've otherwise thought twice about (or needed to save up for) because, well, I could. I didn't get into any trouble or anything but the last 6 months or so I've basically paid off about £2000 off my two cards (I got a MINT card to do a 0% balance transfer from the Egg card).
If I had a choice about it I'd stick with just having a Switch card - definitely safer.