In relative terms £500 is pretty cheap - you could not build one, even a small one for that price, BUT they are very good at glossing over the pitfalls. I can almost guarantee they will now offer a partial refund in exchange for good feedback, then offer some more, in the end it nearly always ends up being a struggle with the card company or Paypal, the Chinese suppliers do not care one bit, all they want is their positive feedback.
I bought a laser cutter, a big one, and it had some broken bits etc plus the tube was not as listed (lower power) I argued and in the end (2 months later) I had about a 50% refund and still kept the machine.
![Smiley :)](https://www.machsupport.com/forum/Smileys/default/smiley.gif)
Its still running today as i had some knowledge of CNC so could fix it up, one thing they are good at is building chassis and frames out of thin metal so the cabinet was good, I just fixed the busted parts and fitted new mirrors and lens.