@christian_follower There might be circumstances where it'll be useful. If you somehow made more this year and don't have any cash to make an rsp contribution to get taxable income down, this might be one way. On the other hand, if you can't contribute, it'll just be added to next year's contribution room so maybe you can do it next year. The tricky part is how sure you are that your various gains can beat the interest rate and how long it'll take to pay back.
If there are no fees, no catch, why not just take it and not use it? There isn't much downside to just taking it and letting it sit unused.