What does the company do well? Their support is second-to-none; very responsive and eager to add features that you require if they aren't already there. I needed DNSSEC, and within a week I'd been invited to test out their implementation of it.
What does the company not do well? Whilst their pricing is very reasonable, they can't compete with the wholesale prices offered by the likes of CloudFlare, but you can only transfer pre-existing domains to CloudFlare.
What do you wish you had known about the company before using? How great their support was, and how fast their DNS is.