Unlike legacy plans, there usually are no monthly free Tokens.
As to usage, there are three methods of measuring your usage. Each of them have their own issues:
Method #1 is the Download Status Meter:
This is kind of a "quick and dirty" look at your usage.
Its "issues" revolve around the fact that it is reportedly slow to update, it for the most part displays in "percentage" rather than hard and fast numerical values.
1% of a Power Pro 15 GB plan is 150 MB so a "percent" type of display is subject to "rounding errors".
Consider that a 15 GB Anytime allowance is 15000 MB divided roughly by 30 days gives you a "daily allowance" of only 500 MB if you are to avoid purchasing tokens.
A 10/10 GB plan would only allow 333 MB per day Anytime period usage and that includes both upload and download.
With daily values like that a meter that reads in percentage is just not "fine" enough to closely monitor usage.
The second method of gauging your usage is from the modems SCC main page display:
Here is one I "anointed" that explains the three sources of data available.
Again the problem here is the "resolution", the "fineness" of the meter output. As a percentage, it is just to "rough" to gauge you daily usage and is subject to "rounding errors".
The third and most accurate of the meters is found after logging in here:
The "at a glance" meter is the most accurate of the three methods. This is the meter that is used to "update" the other two.
This meter has the familiar "percentage" readouts but also has the much more accurate numerical readouts I have highlighted below.
This is going to be your "source" for determining your starting values for how much data you can "spend" daily during a Anytime Byte or Bonus Byte period:
The biggest issues for customers that have upgraded are:
#1: Uploads now count.
#2: The much greater speed will allow you to do things you couldn't before so you will consume data much faster even though your data allowance may be the same or even less than what you could have milked out of a legacy plan.
#3: Having GB's of data sitting in the "bucket" make it look like an all-you-can-eat buffet but if divided up into a "daily allotment" you may find you have a very small daily value if you are to avoid FAP or Token purchases.
As the internet is today, with all the flash, scripts, ads and auto-start video clips all wasting your data, it is essential to run browsers add-ons like Adblock Plus and No Script.
When I upgraded from a HN7000s to a Gen4 my accumulated Tokens followed me over. I then "used" them to transfer them from being "owned" to being placed in my "Token Bucket". Currently have 17.5 GB banked for automatic use if needed.
Yup "grayed out" if none available:
Tokens ready for "auto-use" are stored in the highlighted "Token Bytes Available" bucket: