I wouldnt call the equivalent of the UK average mortage payment insignificant for the average person. Granted you are fine, i would be as well, but it is important to discuss these things when talking about stoozing and how it really isnt as straight forward as just build up **** loads of CC debt on interest free cards and lolz free money!OK just proportionally for my income it's not significant. The 900 figure you've taken is 600 off an account that I would use for grocery expenditure also so you'd have that going weekly/monthly anyway.
If someone's income was a lot lower then yes maybe an issue. If you are semi competent and/or reasonable income to outgoings or save a lot it requires minimal thinking.
In 10 years I've not had any issues but like all things in life your mileage may vary.
It works very well if you've got a high income /good budgeting and or use it to offset high cost items (eg car purchase, house renovations).
A new car upgrade soon might make this an option rather than buying outright it might be worth finding a card to pay for it on.