Get the control panel you prefer by selecting it at order time. Either is available - it's strictly a matter of personal preference. Many people opt for cPanel, because of its popularity - and we can't fault them for that. However, it’s your VPS – so you’re in control - you can have other control panels and software installed instead - it's totally up to you (but faster setup times if you pick cPanel or DirectAdmin).
Change is a good thing. Unfortunately, when you are making big changes to your site or application, there is always room for error. Live-state snapshots takes the idea of a "backup" and takes it forward to its next logical step. Taking a snapshot of your partition not only creates a backup of your files, but also all of the processes running in the background at that instant in time. This way, if you make an error or break something while making updates, you can revert your partition to that exact snapshot, providing a working, fail-safe rollback.
You're an experienced developer who wants full control over your environment. We're giving it to you! You get root access so you're able to access and edit all of your server's files! You get to choose your Linux OS and can even re-load your server with a new operating system on demand! You also get boot, shutdown and reboot control. Now we're talking about serious hosting!
Unmetered hosting is generally offered with no limit on the amount of data-transferred on a fixed bandwidth line. Usually, unmetered hosting is offered with 10 Mbit/s, 100 Mbit/s or 1000 Mbit/s (with some as high as 10Gbit/s). This means that the customer is theoretically able to use ~3 TB on 10 Mbit/s or up to ~300 TB on a 1000 Mbit/s line per month, although in practice the values will be significantly less. In a virtual private server, this will be shared bandwidth and a fair usage policy should be involved. Unlimited hosting is also commonly marketed but generally limited by acceptable usage policies and terms of service. Offers of unlimited disk space and bandwidth are always false due to cost, carrier capacities and technological boundaries.