Switch. Save. Smile!
Want better broadband?

Charge me even I terminated the boardband service.
No reply even I left message in support in website.
Chat support doesn't work on Friday.

Complete unwillingness to help solve problems, poor communication,

very hard to access facebook at times, no issue the moment i swap to mobile data so its the isp not FB , my 300 100 was 100/60 at 5pm today prompting me to look about and leave a review for others

Slingshot, owned by 2degrees who in turn is owned by Voyage Australia Pty Limited, and they are owned by Vocus Group Ltd (formerly Vocus communications) who is owned by a consortium of Macquarie Infrastructure and Real Assets (MIRA) Australia. The latter an Australian Infrastructure Investment Group.
I believe they also piggy back Amazon Networks infrastructure as well.
So, comparing 2degrees...

Average speeds and reliability.

Dont waste your time considering Slingshot as a internet provider, you may save a dollar with a good promotion but they will find the way to rip you off later on. E.g.: disconnection charges, claiming for the return of a modem that wasnt theirs, sneding out 2 wrong invoices after cancellation date was passed, taking months to return the money...