The unfortunate quandary about the BOP is pretty microcosmic for corrections as a field - the overwhelming majority of your high performers will jump ship to other agencies within a few years, unless there's another eligibility issue in play. For a local/state jail or road dog looking to jump to the feds it's a solid way to stop your age clock and get that 6C train started while your applications with somewhere else progress, but I wouldn't recommend it as an entry level gig and I wouldn't recommend staying as line staff longer than it takes to get GS-8 for pay matching purposes.