Hmmm
I bought a Makita LS0815 Mitre Saw about a year ago. The side supports are not particularly parallel, like yours. The "fence" is not straight (seems to be machined on the p**s in two different directions). It has problems cutting anything thicker than a piece of paper as the body gets in the way, you can't hold any wood on the motor side of the thing, the detente's aren't very good as it wobbles around them so I take the angles with a pinch of salt, it's very tricky swopping blades, as it doesn't seem to be designed to have them swopped. The laser came set at a different angle to the blade, the dust bag stitching is crap.
Apart from that it's great.
I think some Makita mitre saws are great and some "have issues" (I usually blame the parents).
I would have taken mine back, but as I'm not a cabinet maker and hate fuss I've kept it. If it's an issue with the type of work you do I suggest returning it and buying a different brand, the problems of wasting time getting a replacement with the same issues or other ones can be very distressing.
Due to having a Mafell KSS I find I don't usually need a CMS, but don't get me on the problems with that :evil: