Depends on how cheap it is and how not-powerful (old) is your PC. A lot of the most interesting X360 games are back compat on newer XBoxes and you get a bunch of added features with that like higher resolutions or framerates on many of them (and no performance issues, which happen occassionally on the original X360).

Make a list of X360 games that are interesting to you, check if they are back compat in XOne and XSeries and then compare console prices. Try to get newer hardware if the games will run and your budget allows.