Viabtc seem to be over crowded right now, is close to impossible to to queue in a transaction.
Confirmtx seems to have stopped working, there are so many complaints from users who paid and there transaction hasn't been confirmed for days now.
If you are looking for a legit btc accelerator, you can check it out to this thread https://bitcointalksearch.org/topic/--2624419 . On every accelerator in that thread has it's own information. And you can choose whatever you like in that thread.