After playing around a bit with this hosting package I can say I don't regret I've grabbed this deal at all. The first thing I did, before migrating or creating any new site, was to create a test site and have been doing some testing on it, with great results and good feelings so far:
- Network response times are good.
- Server seems always quick and responsive.
- For the ones used to cPanel, well, it's not cPanel, but you will get used really quick. You may miss something from cPanel (I didn't miss anything I need to be honest), but there's also some nice additions.
- The included CDN and optimization features, even if you can get better results with other solutions and some knowledge, they work really well and should be more than enough for lots of sites/people grabbing this deal, and will be probably not worth the additional time spent and/or costs for most of the projects you will be hosting on that kind of shared hosting.

So, all in all, let's say that performance and usability wise, I'm really happy, it's nice for a shared hosting, what I don't like:
- In this AppSumo deal, unless you are stacking 5+ codes and get "everything unlimited", the mailboxes can be REALLY short. Having "on average" 1 mailbox per domain I think is really low in most cases, more mailboxes should be needed, I know I'll need more per domain usually, I'd would prefer to have more mailboxes even if they have less storage for each of them or something like that, I don't know what the solution has to be, but I think that having more mailboxes is kind of a must.
- I didn't need to use the support yet, but in some cases (i.e. the server or the connection are 100% down), the SLA 24h maybe too much, I hope that if it's not done already, pretty soon, the tickets are reviewed fast, and then they are scaled according to the severity of the problem or the question asked.

Anyway, to sum up, is a nice hosting I would recommend.