I purchased a used CTD ten inch pneumatic double miter saw about twenty years ago for $1,500.00 it has just about all the features of this saw, no dust collector though. My point? Why not purchase a quality used machine for about half of what you are considering spending on this unknown machine.
With a good saw, it does not matter how old it is, it's how good of a cut you will get. CTD and the like, are built from solid, heavy cast iron parts. There is absolutely no vibration when cutting. These companies build machines that will last fifty or more years, easily. The worst that can happen is you may have to replace your bearings. Your going to have to do that anyway, sooner or later, no matter what saw you purchase. A set of bearings is around fifty dollars.
The real definition of a great cut is determined by the quality of your blades. People will spend five thousand on a cut off saw, then balk at spending five hundred on a good set of blades, go figure. Think about it.
John