I try to be open minded and assume good faith of posters.
On the one hand I have never needed Zen support except to activate the IPv6 routed subnet and that was handled promptly.
c.f. IDNet were provisioning dual stack so probably assume their customer base is self-selective enough to know what they are doing if ordering from a non-mainstream ISP and wires-only to boot (no bundled router pre-configured).
On the other hand a sad reality is people can be paid to join forums and e-shop reviews whether to fluff up or trash-talk a product or service so I am slightly suspicious when it is someone's first post rather than to ask a pre-sales question.
That said I have no reason to suppose anyone here is anything other than genuine.
I still say it is self-selective though as 1000s of customers will have no reason to post here if all is working well and they have no burning questions.
prlzx on Zen: FTTC (VDSL) at ~40Mbps / 10Mbps
with IP4/6 (no v6? - not true Internet)