There is a reason that the expensive cnc machines are just that.
If it isn't equipped with precision ground ballscrews, recirc anti-backlash nuts and THK or similiar rails to ride on your going to have trouble getting precision out of the machine. Every .0002 off here and/or there gets multiplied over and over all the way to the end cutter and you'll end up with something that has trouble cutting pockets and parts that won't fit without a glue line.
Even if your controller is able to help knock out backlash and take up some of the slop you'll still have problems and wish you had spent a little more $ the first time than a lot more the second time around.
Every person I have talked too that spent cheap to start, ended up either totally rebuilding the one they bought first or just unloading it and starting all over again with something that has precision built into it the first time.
Both the hard machine and the controller have to be able to work together or you'll be banging your head on the wall for a long time.
Sure there are machines out there that will chop a pocket out and make a piece to use as filler but what I'm talking about is when your all finished and you look at the inlay with a 5X loupe and don't see a single hair of glue.
It just depends on what you want it to do......
<~~~of course this is just MHO for those who care..................