If you can get 15-30 Mb service cheaper, this is probably overkill unless you are sharing bandwidth with a lot of people. With that kind of speed you could almost share with a neighbor.
Second, like others have said the speed may be of no use to you depending on your router. The only way you will see the full 1 gbs is if you have a computer or device hardwired to the modem or router. If you have a good 802.11AC wireless router, and a device with a built in 802.11AC capable radio within about 20 ft and no more than 1 wall, you will able to see about 1/3 of that speed over-the-air. Above about 200-300 Mbps is at the limits of the best household wireless routers and the cost around $200.
Older 802.11N cuts out at about 150 Mbps...
No single video stream uses this kind of bandwidth right now so the only way you will notice a benefit is if you have a lot of people streaming simultaneously, or you regularly download large files like video games and HD movie rips. The only advantage of this service today is large file downloads, and maybe running a business from home.
For reference netflix standard 1080p HD streaming needs 6-12 Mbps. Their 4k standard only needs 15 Mbps.