My dear Erik
I can't live without it, I use it for:
1. test all kinds of filters analog, digital, passive or active, crystal filters I design or get of the shelf.
2. Test my home made scope displays.
3. test frequency counters.
4. use it to modulate rf signals for comms experiments.
5. use it as a local oscillator for radio receivers.
6. use it as sweep oscillator for certain applications I play with.
7. Many more uses.
In the old days I had problems with analog function generators for the keep drifting with age, temperature, humidity, supply voltage, potentiometer getting old or dusty, not very accurate ...etc, since I met NCOs it was love from first sight, as Steve did.
You see it is best thing since sliced bread!
Mahmood