ViaBtc works, it has worked for hundreds of members and I've used it just two days ago and managed to get one tx confirmed in a block mined by them.
So, what happened when you used it that made you think you should not trust it?
When I said not to trust them, I mean I don't believe if their service really works.
It works 
I have to wait for some hours before my transaction was accepted by them due to their hourly limit
You need impeccable timing to submit your transaction.