After having used RapidVPS.com for a month, I decided to write a brief review of their level of service. JFYI, as usual
I was using their very basic package - Rapid.one - providing 10Gb storage / 200Gb bw / 128 Mb RAM (2Gb burstable) / Plesk 7.5 Reloaded. All this for $30.
Overall server performance was more than satisfactory for such a basic package. The server was up nearly 100% during the whole month (only one outage - I'll mention it below), and I didn't feel like it's slow. Well, slocate reindex DID take ages, but there was quite a bit ti slocate.
The network was stable either, but not fast. I failed to download faster than 400 KB/sec from my 10Mbit port (tried from Savvis-hosted dedicated which DID pull 1MB from the other site), but maybe that's just routing, or just me...
Also, I'd like to mention that they did put me on some powerful hardware - AFAIR it was a 4-way (or 2-way HT?) 4Gb monster.
Now THAT's what is really worth talking. I have no idea of the staff size, but support ticket handling was SLOW! It took them 3 days to activate me (credit card verification added some delay); my trouble tickets were handled in no less than a whole day, ans I always had to post dumb followups like "Guys, are you there? What's with my request?". I was VERY disappointed after being with my current shared hosting provider that has a 15 minutes average response time...
Besides, those guys accidentally unplugged my VPS, and it was down for several hours.
All that said, I consider RapidVPS to be a low-end UNmanaged VPS. That is, if you do know how to handle your stuff and don't really need support - you can go for it, it's cheap and reliable. But if you expect some communication with techs, or even worse - with billing, forget it.
P.S. Of course, this review doesn't claim to be either concise or 100% true - that's just MY own experience with this company. Hope it helps.