I used their exchange once to sell small amount of Bitcoin since they support my local currency and bank. The volume is low, but i don't experience any problem.
Since i only used it once, i wouldn't recommend it due to low volume and i've no idea how secure is their exchange, but i'm sure it's not plain scam.
Most newbies might come across it, I was one of them back then.
After I discovered Remitano, I was like wtf, the fees were lower than Luno. Although there were more steps on Remitano, I feel like it's more worth it.