“I'd be more concerned with shutter accuracy, which is probably so bad as to be worthless. You can spend another $49 on an ebay shutter tester and find out you squandered $650 on something completely unusable.”
While I find this statement a bit hyperbolic, yes, checking the shutter speeds is very important. Every Rollei TLR I have purchased has needed the shutter serviced. I am not that concerned about actual shutter times compared to the settings, consistent times are what I look for. I make a chart with actual speeds and it’s the higher speeds that are usually fairly far off from indicated. I keep my shutter tester handy to check all my leaf shuttered lenses.