Online Sports Book

Does anyone have any experience using the online sports books through local Vegas casinos?

I am skeptical of online gaming and I would consider using a site backed by a local casino but was wondering if anyone has any first hand experience with them.

Thanks!

I have used the sports book app through both the Venetian and M Resort. It allows you to place bets anywhere in Nevada (it is tied to your GPS in your tablet or phone). It worked perfectly and I appreciated the convenience of not having to go back to the counter at the Sports book to make further bets.