sounds like you made a good decision but who do you use for your internet provider? as I am under the impression you need an internet connection to use Roku. Internet can be very expensive too. :(
I have Comcast for my internet service. I pay 34.95 a month and get 30mb download speed with 6mb upload speed.
Yes we have two Roku devices which can stream simultaneously while our kids are on their gaming pC’s playing battlefield four at the same time and still have bandwidth to spare.
I’m usually listening to Spotify while all that’s going on. No hiccups in streaming anything.