I am running on a liquidweb shared server. My review is as follows:
Signup was easy, but it took over 24 hours to have my shared server ready. Felt a bit unorganized as I had to go through emails to figure out the update of my server etc. With the shared service you don't have complete access to the server, so I often have to go onto the live support to have them add a sub domain, change mx records etc.
The support is very good as it is available 24/7, but some of their technicians aren't too great. I had to contact them 3-4 times because someone kept using the wrong Google apps mx records and my mail server wasn't propagating correctly. Other than that the support has been fast, kind and easily accessible.
To date I've only had one outage that has last about 20-30 minutes.
Other than the issue above I have no complaints. Overall service is fast, friendly and reliable. I would recommend them.