Hey, glad to hear your considering picking up an R2!
Yes, with the correct configuration you will be able ensure your gaming traffic is treated with priority and you only connect to nearby servers with good ping!
The team here use a variety of different ISPs and all have been able to utilise the R2 to its full potential! As long as you're getting a good, consistent connection, you'll be fine.
Any will work, I'd personally prefer Chrome over Safari but that's just me
We suggest initial setup be done over wired and I'd also suggest you ensure your One X is connected via wired too!
You will need to use the ISP provided router/modem as the R2 does not have modem functionality. The setup guide will ensure you get everything up and running properly, but essentially you'll have:
ISP Modem/Router -> R2 -> All connected devices
It doesn't really matter if you're using wired, as long as it's within the maximum length of the type of cable you're using.
To ensure you're getting the most out of the router, you'd be best off connecting everything to the R2.
All orders are shipped next day, but there may be some delay over the festive period.
Let me know if you need anything else!