Look at this on eBay http://www.ebay.co.uk/itm/122085645160

just wondering is this worth a punt or stay well clear

Plastic. Not branded. From China. It’s a no from me.

Because non of the branded stuff comes from China.

The top pivot and its lack of supporting material would put me off.

Branded stuff does come from China, but brands tend to have tighter control of QC.

Nope from me.

Lower pivot looks like a weak area too, I’d be worried front and rear of frame is a temporary relationship! That said nice looking frame.

You could pick up a carbon cube full suss frame from bike discount for less

It’s not that cheap IMO. £625 + Tax/vat if you are unlucky and then it needs a shock.
As Jonnyboi says this looks a better option
https://www.bike-discount.de/en/buy/cube-stereo-120-hpc-pro-29-rahmen-black-n-green-593285/wg_id-7327

I’m looking more 26″ or 650b

I’m looking more 26″ or 650b

http://www.ebay.co.uk/itm/Marin-Mount-Vision-CXM-Pro-Frameset-Fox-Float-X-2015-Blk-Orange-17-5in-RRP-2500-/222301060353?hash=item33c22cfd01:g:d6EAAOSw4GVYGIRN

http://www.ebay.co.uk/itm/Marin-Attack-Trail-CXT-Pro-Frameset-2015-Fox-Float-X-Blk-Silver-17-5in-RRP-2500-/222301049312?hash=item33c22cd1e0:g:tZkAAOSwHMJYGHxN

They’ve sold quite a few, which are starting to reappear on ebay minus the Float x shocks!

hum could be a good choice

I got the Attack Trail, looks nicer than in the photo. Came with the Float X shock, axle, headset, grips and internal cable routing tubes installed.