Anyone familiar with Netgear Wireless Dual Band Gigabit Router WNDR4300?

Switching to Charter from Uverse. Max internet they offer in my area is 30 mbps. My problem is a large family with heavy strain on wireless network (too many devices). I'm hoping Charter can handle the load better than Uverse. My max Uverse speed offered was 18 but we would get between 7-12 mbps max.

The above router is what Charter offers as rental ($5 month). They said its very strong and can handle speeds and loads well. Is this accurate or would I be better buying my own wireless router? Is there a router that can accommodate multiple devices without losing performance or is that just not possible?

thanks