I have a bit of a different perspective than most here, since I'm a service tech not a machinist, but I think I can add a bit to the conversation.
-Their parts manual shows the machine having 25mm roller guides and fixed ends on every ballscrew. The guides are comparable in size to a Robodrill (though the Robodrill is THK vs Hiwin), but the supports are much better than a Robodrill, which has a floating end on the Y and Z. I can't comment on the quality of Syil's bearings, but they at least give you a size to reference.
-Ballscrew sizes aren't given. 20 or 25mm, I'd guess. Probably Hiwin again, maybe another Taiwanese brand (TBI, PMI?).
-Spindles are not Big Plus.
-Their electrical manual is... well at least they gave you something. That's more than 90% of Chinese manufacturers do.
-Siemens parts can be ordered from other sources when necessary.
My take: not a good buy.
It looks like it has all the parts there to make a good medium range machine, but so much is determined by the care the builder puts into the making it's a huge risk. The machine might arrive and make good parts. Or it can arrive with a terribly ground spindle or need the table to be squared. Are you prepared to do that work yourself? Because you will be the the only one in the US who has seen one of these machines. That's after the headache of customs.
That's not to say good stuff can't come out of China. Look at any Brother for an example.
And even if the machine is the best 30 taper machine ever made, ballscrews and spindles are practically consumables. Any tech worth 2 pennies can rip a ballscrew out and throw a new one in in a day, but how long will it take to ship one over? If they even have stock of them. Methods and Yamazen have literally hundreds of ballscrews and spindles sitting on shelves. If a button on the control goes out, how many emails will it take to get a part number?
If I was looking to save some cash, I'd look at a 5-10 year old machine and have it inspected under power. Stick to Haas, Brother, or Fanuc.
Here's a 5 year old Robodrill on ebay for only 5 grand more than the Syil:
Link
The same seller has a 2011 iF for $52.5k.