Is is worth it? The answer to that is entirely subjective. As with any used car, I highly suggest taking it to a trust mechanic and asking them to look over it.
What parts are aftermarket? Do they have maintenance records? Is this an automatic or manual?
If this is your only means of transportation, I would be very careful with your decision. If it's more of an additional car for fun type of situation, probably doesn't matter as much.
I purchased my 2004 G35 manual sedan 4 years ago with ~ 123,000 miles and I just passed 167,000 miles. It's a fun car. Only 1 minor mechanical issue in 4 years - frozen brake caliper. I do some of my own car work so it's also reasonable in terms of cost. Obviously I'm just giving my experience, but it's been a good one and I would do it again in a heartbeat. In general it'll be more expensive to pay a shop for work than with a Camry, etc. The VQ35DE is considered fairly bulletproof as an engine and besides the occasional oil consumption issue, it will likely not have any problems.
I would recommend lurking the forums here more to get some idea of common mechanical issues.
Without any extra information, it seems like a reasonable deal, but the details are important with used cars.
Good luck on the decision,