The issues I was having at the time though were extremely annoying in that my 2 degrees phone would sometimes say it had good or even great signal but data just refused to work, while my work phone on vodafone worked perfectly and friends spark phones also worked fine.
I've been with 2degrees coming up 6 years and have been looking to jump ship due to the same issues.
2degrees only has coverage in the main town area here, as soon as I travel outside of that I roam onto Vodafone and data is hit and miss.
Signal can be showing full bars but data just refuses to do anything.
Also in fringe areas where it gets a hint of 2degrees signal it tries to stay connected to 2deg or switches back and forth making calling and data use near impossible.
If 2degrees have their own good coverage in your area it'd be fine, if you'd be relying on VF roaming, be wary.