What does the company do well? I have been with Nexcess for many years. I host my sites and my client's sites with Nexcess. They are reliable and customer service is fast. I use them for Magento and WordPress.
What does the company not do well? I wish they used CPanel for site management instead of Interworx's Siteworx. CPanel is so much better than Siteworx which isn't intuitive and very, very dated. Thankfully you rarely use it.
What do you wish you had known about the company before using? Nexcess provide reliable hosting with little to no downtime. I am hosting my website and sites for my clients. I trust Nexcess!