I've always maintained that if you have a device that has some kind of issue at one point...to the extent that you would request or seek out a replacement...that it would behoove you to go with the replacement, as the problem that is, for the time being alleviated, may come back to haunt you later, and that could happen beyond your warranty period, which would make you regret not switching to the replacement device.
And in that regard, there really is no downside to taking the replacement one...worst case, you have to replace it again if it has the same issue (which is unlikely), and the warranty will end at the same time, so that won't effect anything either.