They are very reputable.
If you deposit via Neteller you will have to withdraw via Neteller. Neteller withdrawals take a while to process around 3-5 business days.from my experience. They do have faster withdrawal options like Bitcoin and EcoPayz.
Some things to note:
There is a 72 hour wait period to request payout from deposit.
You can only request one Neteller payout per week.
There is a minimum rake requirement on your deposit that you need to meet in order to be able to withdraw.
The timeframes above for withdrawals are from my experience and what I have read their withdrawal policy states that all withdrawals will be processed within 15 business days.
If you need help CardChat has thread that is managed by a representative from ACR. You can post your questions there, link below.
https://www.cardschat.com/forum/poker-rooms-10/official-acr-thread-217550/
I have an account there, but never deposited. But, I'm thinking to deposit there. Are they reliable? How long does it take a cash out using neteller?