So got round to fitting it.
One of the locating pins for the circuit board was ever so slightly out so I just snipped it off, doesn't seem to be an issue. The cavity for the chip is open so if you split the key there's a chance it can fall out, I guess this was done make assembley simpler. I blocked it up with a hot glue gun, not wanting to take any chances of it falling out.
Took 10mins, key sticks out ever so slightly when in closed position but overall 8/10 I'd say. I'll have to order up a vw emblem at some point.