Firstly, the pricing is good compared to other migration apps. The most important opinion I would to offer as this review is that the support is very good. Rarely does anything run smoothly, so having the right support is crucial. Very good value for money.
Migrating from Zen-cart to a more modern platform is no easy task, so while there were a couple of things that didn't shift well at the start, they were more than happy to promptly provide a fix without delay. Very happy with their work and follow up.