I used to have a t25 and sold it last year. Just me and dd used to go away in it. They are lovely but I'm afraid for me the cons outweighed the pros. However if I'd had more time and/or more money I'd have kept it.
They are expensive to run, fuel costs are high, they need mot, insurance, tax like other vehicles and it adds up. On top of this repairs, body work repairs, etc. was costing me a fortune.
Fairly cramped inside, ok for two for a weekend. But a week, if the weathers crap isn't fun.
They do break down, not just engine, but electrics. I've been away on my own before unable to cook, charge phones, etc.
Packing stuff up every morning in order to drive somewhere is a real pain.
They're fun to drive, look cool, nice and warm and cosy. They're also much more sound proof than a tent so that's the pluses.
They're better than a caravan if you want to go somewhere for a night to two and then move on to somewhere else.
They can be a bugger to park when out and about. Difficult to manoeuvre, can't get in car parks with height barriers, need bigger spaces when on street parking.
I'd be tempted to do a towing course and get a caravan.