Which 3d printer to buy for about £500

[curious aardvark]

looks a bit too 'homemade' for my liking.
Plus says 150mm print height in the ad but 80mm in the detailed blurb. (ah - version 2 is 150mm)
And it's a company I've never heard of - so most likely made in a small workshop somewhere.

And for another £10 you can get one of these

In the pm1 favour:
glass printbed - so should be very flat.
Being sold by an english company. And by the looks of it made by them as well. http://www.3dprintingtech.co.uk/
They mill their own heatblocks so probably make the whole machine. Yep - they pretty much make all the parts as well.
So you 'should' get good support and warranty.
Damn good price for a ready built metal framed glass bed printer.

Not in it's favour:

No control panel or sd card functionality.
Just the one extruder

I have to say, dual extruders are probably not going to get much use - but I would NEVER now have a 3d printer without it's own control panel and sd card reader.

If they had a model with lcd and sd card functionality - I'd definitely say get the PM1.
Tough call - but for me the ctc/flashforge/wanhao wins.