So after all this time of using GigaPros, I closed it down this week.
There were a couple reasons for canceling it:
GigaPros seems to have an issue with their billing system. I could never figure out what was going on, but I had to constantly setup my automatic payment, and it would constantly fail. I had my service suspended numerous times because payments were never processed on time. I even had support tickets for resetting the auto payment, and they still didn't work right. So, kind of annoying to deal with every month.

If you go with them, stay on top of the billing and make sure you payments get processed correctly, and on time. Maybe rather than pulling payments in, push them in from your banks bill-pay.
Their IP address randomly changed on me. I never got a notification or warning (unless I really missed something). One day, the VPS server went down for maintenance, and came back up with a new IP. My domain name was pointed to that IP, so that caused some issues obviously. Still not sure why that happened. I believe it was a server outage on their end, and when they restored it, they changed it.
My library got a little out of control. The 100GB of storage is nice at first, but runs out quickly. You definitely can't use FLACs, or even consider videos. Plus, even if I had unlimited storage like QVIVO, I live in the US. Land of the crippled upload speeds. If I made a tiny tweak to tags, album art, or the organization of my files, I had to re-upload any changes.
I opted to run my own server at my house and not worry about limited storage, or lengthy uploads. Yeah, I know, back to where I started...
MusicCabinet. This add-on is SO COOL. I'm not entirely sure I could set up MusicCabinet on their hosted VPS (CentOS). It is so much easier to set that up on my own machine and tweak things locally, rather than thru the VPS. If you want to use GigaPros, or similar, find out if you can set up the Postgresql server and get it running with the MusicCabinet addon.
I wish the app was managed similar to how WordPress, or other web platforms are managed. Meaning, it would be nice to be able to upgrade it myself without submitting a support ticket.
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Those are some followup thoughts on using a hosted VPS thru GigaPros for Subsonic.
Would I recommend them? Sure. It's $10/mo. It's not so ridiculously expensive that you really have to carefully consider it. And you can cancel anytime. It was plenty fast, and supported multiple users. I don't expect miracles for $10/mo. Give it a try, see if it works for you.
P.S. Oh, and since I mentioned QVIVO above: Don't bother using that. I tested that extensively, and long story short is that its terrible. Roll your own Subsonic + Plex server.