I have been a user of SwitchLink for a while now. I am very impressed and pleased with the level of service I receive. I have the VPS-500 package.
I was very surprised at the support. Every time I have opened a ticket, I have received a reply within 2 or 3 minutes, sometimes even less. I don't think you'll find support better than this on the VPS Hosting Market.
SwitchLink rely on the M247/IceColo network in Manchester for their network. It isn't the best in the world, and has network outages from time to time, but the VPS uptime isn't effected by this.
If you need a great VPS with fantastic TRUE 24/7 support, I highly recommend SwitchLink!