Here's a tool that works exclusively with NetFlow v8 (and sFlow) data:
https://neon1.net/as-stats/
Its Readme kinda sums up what v8 records can be useful for:
"How it works
------------
A Perl script (netflow-asstatd.pl) collects NetFlow v8 AS aggregation records
or sFlow v5 samples from one or more routers. It caches them for about a
minute (to prevent excessive writes to RRD files), identifies the link that
each record refers to (by means of the SNMP in/out interface index), maps it
to a corresponding "known link" and RRD data source, and then runs RRDtool. To
avoid losing new records while the RRD files are updated, the update task is
run in a separate process.
For each AS, a separate RRD file is created as needed. It contains two data
sources for each link - one for inbound and one for outbound traffic.
In generated per-AS traffic graphs, inbound traffic is shown as positive,
while outbound traffic is shown as negative values.
Another Perl script, rrd-extractstats.pl, is meant to run about once per hour.
It sums up per-AS and link traffic during the last 24 hours, sorts the ASes
by total traffic (descending) and writes the results to a text file. This
is then used to display the "top N AS" and other stats by the provided PHP
scripts."
