We use Segment->Vero as our main automated email marketing flow (~5M emails per month so not huge, we use Sendgrid via Vero to actually send the emails). We're

We use Segment->Vero as our main automated email marketing flow (~5M emails per month so not huge, we use Sendgrid via Vero to actually send the emails). We're looking to change to something more established like Iterable/Customer.io as Vero is very slow (UI and latency to send emails). More than happy to provide feedback as to what works/doesn't in your competitors.