I have a bunch of HostUs boxes I picked up over the past few months to replace my 10 Crissic yearly boxes. I have at least 1 box in each location.
Proof: 
I host a couple of production sites on the boxes, all of which are backed up by my boxes at Ramnode.
Haven't experienced any downtime myself (anything greater than 2-3 minutes), (maybe a couple of times a month some high ping spikes / network blips but whoever is abusing the node gets shutdown by their anti-abuse scripts).
Support is always pretty quick, Andrew and Alex and the other staff always reply to my tickets within a timely manner. (I've opened around 6 in the past 6 months)
@AlexanderM is very active here which is great to see.
One recent event that made me really happy was having an on-going issue I had resolved. What I really liked was how they handled the ticket, and how they kept me constantly informed with what they were doing, etc.
I had a very rare, strange issue, along with another member on this site, where our php-fpm process kept getting killed every couple of hours.
You can read more about it here: https://www.lowendtalk.com/discussion/comment/1661729/#Comment_1661729
I asked for help on LET and we came up with a script to combat the strange issue, but earlier this week it got out of hand, it was getting killed 50+ times a day so I reached out to @AlexanderM via PM here on LET and he said to open a ticket and then escalated it.
(Note: I PM'd Alexander on LET because the other user that was having the issue said he tried contacting support in the past and at the time they couldn't figure it out.)
After their investigation (1-2 hours) they found that the node was misconfigured and it resolved the issue.
I will be keeping all of these boxes and will probably buy more in the months to come.
HostUs is awesome, they run a great network and offer great services/support. Keep it up. :)