Use the code "manic" without quotes, it will waive the setup fee when paying monthly or give a $79.40 discount off any plan when paid for a full year..
I have been using DH for a little over a year and overall have been very happy with them. They can be a little slow on tech support, but the majority of questions a person would have are answered in the wiki or forums. They recently had some problems with downtime from power failures at the data center but those should be a thing of the past..
I have noticed minor slow loads in the panel at times, but not very often.. The panel has alot of features you won't find in cpanel etc..
Until recently I would have never considered using them as a registrar without using them for hosting also, but they offer free whois privacy now..