I've used Bill Me Later for other purchases since it was free financing. However their interest rates are borderline criminal so you want to be *very* careful to pay it off in time, preferably a bit early, otherwise you'll get hit with a big bill for accrued interest. They are counting on you forgetting or being unable to pay it off during the free financing period.
It's actually a decent financial tool if you have the discipline to leverage it correctly. My bank allows me to schedule future payments so I just planned out a payment schedule to guarantee early payoff and set it up at the beginning. That eliminated the possibility of the deadline sneaking up on me or missing a payment.
Also be careful about financing more than one purchase at a time. IIRC, they have a certain way of applying payments where it goes to interest free balances first. That means if you have an existing balance and then buy a big ticket item (laptop) on free financing you will be unable to pay off the original balance until the laptop is paid off in full. You will be charged interest on that original balance every month until you pay off everything.
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