Refurbished Freezer is a Good Idea

Most likely it's sound but, is there any maintenance history associated with what and how was refurbished?

The four most common freezer problem-causes are, failing or failed compressor, failing door gaskets, broken thermostat, and/or defrost cycle failure.

If you're buying from a reputable source, then it's highly likely that all of these have been checked. But still, do your due diligence prior to purchase.

Many of the problem-causes can be fixed by yourself using YouTube. I've only ever needed a repairman to replace a compressor.