Have been using them for a while and overall I'm happy with the service. In particular, it's really good they have a live chat facility on their site, so if you encounter any issues or have any questions, you can speak to someone quickly.The only downside is they count and charge you for unsubscribed/bounced email addresses as part of your subscription and they once rejected an import I did despite the list being my own and 100% opt in.Other than that, they've provided a reliable service. I've tried other providers and they're much better than the "industry leaders".