is onplus good phone should buy it ?

Well it's good for convenctional users but not for hardcore gamers.
Interesting comment since most reviewers give the 5 high scores for gaming. The extra ram and the 1080p screen make for a very nice and smooth gaming experience. At least so say the reviewers.
 
Oneplus are a company that do there best to make a quality phone for a lower price than the competition. There phones are always in the top phones of the year.
 
It's not the greatest out there, but is still a good phone if you don't mind the lack of true OIS and a microSD card slot.
 
If you are looking for a phone within a smaller budget, then you definitely should. However if you have lots of money to spend on a flagship, I reccomend the Galaxy s8, or wait for the note 8 if you want the bigger screen.
 
My friend got one recently and she loves the low light capability of the OnePlus 5 camera compared to her previous Samsung Galaxy.
 
I would dearly like know, what networks it does "not" support in Australia.
I've heard mixed messages on this one, but would love to buy this phone.
 
Heck the S8 is about $575 USD. I'd be more inclined to get that rather than the OP5. Their prices are too close to the flagships out today and you're missing a lot. IP68, QHD screen, better camera Micro SD card, bezeless screens.

When you look at the competitors they're offering those features for only 50 to 100 dollars more. So ask yourself if you're really that pressed for money or don't need those features.
 
Yes. It's worth it. If you don't like it, sell it, many of there will pick it up. Price makes that an easy option.