Here is my view on this subject.

I have owned Universal machine and had no issues with it performance wise but it was so painfully slow. For that reason I got Trotec Speedy 300 for my needs (best move I made). I also get local support for parts and answers if required.
90% of my work is raster engraving and speed was needed to get the orders quickly. I own Xenetech rotary engravers and could have gone with their laser as speed is on level with Trotec but support was from USA (some other issues there).

If I would go with Chinese laser of any sort it must have a local support as well. I just cannot be without fully operational machine more than 24 hours.