It's an ideal upgrade for a shared client to move to a VPS; however, moving from a reseller to a VPS is only recommended if the you need more control of the box.
Otherwise, reseller hosting is preferred for 99% of resellers because you get all the reseller tools (including WHMCS for free), and you have managed hosting for your clients.
Here are some specific needs which will require a VPS or Dedicated Server.
- Office emails - If you have multiple email users working from the same office (same connection IP address), then you will want a VPS. The reason is that shared and reseller plans limit POP and IMAP connections to 30 per hour per connecting IP.
- Mass emailing - If you advertise through email or have a large contact mailing list, you will want a VPS. The reason is that shared and reseller plans limit each domain name to sending 500 emails per hour.
- Custom installations - If you want to develop a custom hosting environment, or want to install something which is not compatible with our shared servers, then you will want a VPS. The reason is that shared and reseller plans do not allow you to change the included server hardware and software; we must provide a stable and consistent environment for every one on a shared server, and allowing changes will inevitably affect the other users.
