The main thing a $70 set up will give you is (ideally) proper existing bridge fitting, adjust the nut for low action and prevent buzzing, and bridge placement for intonation assuming the neck was slotted and fretted correctly. If the mando feels comfortable and is in tune up the neck, and there's no daylight between the bridge feet and top, I would only recomend new strings. I'm sure you already know this but I went into more detail in case there there are others with new mandos who may have the same question... no offense intended!
There are two things to aim at in life: first, to get what you want; and, after that, to enjoy it. Only the wisest of mankind achieve the second. Logan Pearsall Smith, 1865 - 1946
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